Bump http to 6d9f9efe04886d9685fbfb1a76ba24a71b6c951c

Changes:
```
> git log --format="%C(auto) %h %s" f0a02f9..6d9f9ef
 https://dart.googlesource.com/http.git/+/6d9f9ef blast repo changes: auto-publish, github-actions, no-response (1133)
 https://dart.googlesource.com/http.git/+/d8b237d [http] Migrate to the latest pkg:web, require Dart 3.3 (1132)
 https://dart.googlesource.com/http.git/+/5179d1c Bump actions/cache from 3.3.2 to 4.0.0 (1125)
 https://dart.googlesource.com/http.git/+/0b803e8 Bump dart-lang/setup-dart from 1.6.0 to 1.6.2 (1124)
 https://dart.googlesource.com/http.git/+/82e0424 Use preferred flutter version constraints (1119)
 https://dart.googlesource.com/http.git/+/ccefa7c Support `BaseResponseWithUrl` in `package:cupertino_http` and `package:cronet_http` (1110)
 https://dart.googlesource.com/http.git/+/e7a8e25 Add `BaseResponseWithUrl.url` (1109)
 https://dart.googlesource.com/http.git/+/c8f17a6 Add a contributing guide (1115)
 https://dart.googlesource.com/http.git/+/ebd86b9 Add the ability to get response headers as a `Map<String, List<String>>` (1114)
 https://dart.googlesource.com/http.git/+/5c75da6 Add tests for sending "cookie" and receiving "set-cookie" headers (1113)
 https://dart.googlesource.com/http.git/+/c2a6d64 [cronet_http] ⬇️ Downgrade `minSdkVersion` to 21 (1104)
 https://dart.googlesource.com/http.git/+/661f5d6 Use `package:http_image_provider` in all `Client` implementation examples (1089)
 https://dart.googlesource.com/http.git/+/473a892 Remove the "play-services-cronet" dependency in the example app when building `package:cronet_http_embedded` (1103)
 https://dart.googlesource.com/http.git/+/e79ebe1 Fix `labeler.yml` (1099)
 https://dart.googlesource.com/http.git/+/73b0b1c Bump actions/labeler from 4.3.0 to 5.0.0 (1096)
 https://dart.googlesource.com/http.git/+/15ec3ba Prepare to publish `package:cronet_http` as 1.0.0 (1087)
 https://dart.googlesource.com/http.git/+/26e55c3 cronet_http: require android API level 28 (1088)
 https://dart.googlesource.com/http.git/+/b10f448 [cronet_http] Enables CI for `cronet_http_embedded` (1070)
 https://dart.googlesource.com/http.git/+/a5b8eec Prepare to publish cupertino 1.2.0 (1080)
 https://dart.googlesource.com/http.git/+/c114aa0 Add a fake response for PNG images (1081)
 https://dart.googlesource.com/http.git/+/db2cb76 Run web tests with wasm with dev Dart sdk (1078)
 https://dart.googlesource.com/http.git/+/36f98e9 Fix a bug where BrowserClient was listed as requiring Flutter (1077)
 https://dart.googlesource.com/http.git/+/db7f165 Provide an example of configuring IOClient with an HttpClient. (1074)
 https://dart.googlesource.com/http.git/+/cd748b6 Document that runWithClient must be called for every isolate (1069)
 https://dart.googlesource.com/http.git/+/f585947 Test persistentConnection with large request bodies (984)
 https://dart.googlesource.com/http.git/+/7c05dde Add documentation for "no_default_http_client" (1068)
 https://dart.googlesource.com/http.git/+/d8983fa Add support for setting headers for all requests (1060)
 https://dart.googlesource.com/http.git/+/c90496e Document how to use replacement `Client` implementations (1063)
 https://dart.googlesource.com/http.git/+/c8536e4 [http_client_conformance_tests] Updates to support wasm compilation (1064)
 https://dart.googlesource.com/http.git/+/5dd5140 Bump actions/setup-java from 3 to 4 (1065)
 https://dart.googlesource.com/http.git/+/064f510 misc cleanup of yaml files (1061)
 https://dart.googlesource.com/http.git/+/22f52e2 Update pubspec.yaml to 0.4.2 (1059)
 https://dart.googlesource.com/http.git/+/40a46d8 Fix a bug where cronet_http sends incorrect HTTP request methods (1058)
 https://dart.googlesource.com/http.git/+/c125ed5 [http] Allow pkg:web v0.3.0 (1055)
 https://dart.googlesource.com/http.git/+/9fb4cfa Update lints to latest, etc (1048)
 https://dart.googlesource.com/http.git/+/5e84d9f Update platform-specific imports for wasm (1051)
 https://dart.googlesource.com/http.git/+/8c9feb5 [http] Fix type cast for dart2wasm (1050)
 https://dart.googlesource.com/http.git/+/a2f0b25 [http] use pkg:web, require Dart 3.2 (1049)

```

Diff: https://dart.googlesource.com/http.git/+/f0a02f98f7c921e86ecc81c70f38bb6fbccc81b9..6d9f9efe04886d9685fbfb1a76ba24a71b6c951c/
Change-Id: Ic67698b3c808f4fc550cd3c59dc8efdf508384df
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/353202
Commit-Queue: Devon Carew <devoncarew@google.com>
Reviewed-by: Kevin Moore <kevmoo@google.com>

DEPS

@@ -149,7 +149,7 @@ vars = {
   "flute_rev": "a531c96a8b43d015c6bfbbfe3ab54867b0763b8b",
   "glob_rev": "ef5f0650f66dc64587b11757fe3303538cfeb1d8",
   "html_rev": "327e37a6a4dd46599737ee982f280d73a8f646f7",
-  "http_rev": "f0a02f98f7c921e86ecc81c70f38bb6fbccc81b9", # https://github.com/dart-lang/sdk/issues/54165
+  "http_rev": "6d9f9efe04886d9685fbfb1a76ba24a71b6c951c",
   "http_multi_server_rev": "ba9d07f3596b24718ddf45c9e071d40879cca565",
   "http_parser_rev": "84db8b029d9b51859a0bb4966859af009f9442e3",
   "intl_rev": "5d65e3808ce40e6282e40881492607df4e35669f",