test: Fix compatibilty with new toml_edit

`toml_edit` fixed a bug in 0.13.4 that this test was relying on that is
meant to help with rust-lang/cargo#10349.  This basically restores us
back to the pre-toml_edit behavior for published manifests.

Cargo.toml

@@ -57,7 +57,7 @@ strip-ansi-escapes = "0.1.0"
 tar = { version = "0.4.36", default-features = false }
 tempfile = "3.0"
 termcolor = "1.1"
-toml_edit =  { version = "0.13", features = ["serde", "easy"] }
+toml_edit =  { version = "0.13.4", features = ["serde", "easy"] }
 unicode-xid = "0.2.0"
 url = "2.2.2"
 walkdir = "2.2"

tests/testsuite/publish.rs

@@ -1284,6 +1284,8 @@ homepage = "foo"
 documentation = "foo"
 license = "MIT"
 repository = "foo"
+
+[dev-dependencies]
 "#,
                 cargo::core::package::MANIFEST_PREAMBLE
             ),