Explicitly accepting go fmt of vendored decode_test.go

- this file was recently updated in a bug fix on parsing float values.
  as a result what _was_ a string is now a float literal (see #483)
- `go fmt` uses lowercase 'e' for the exponent notation
- various tooling applies `go fmt` to our code while building and releasing.
- we've updated our build and test scripts to skip this package (see
  prior commits).
- Go Releaser is also `go fmt`'ing our files just prior to release.

Signed-off-by: John Ryan <[email protected]>

pkg/yamlmeta/internal/yaml.v2/decode_test.go

@@ -700,7 +700,7 @@ var unmarshalTests = []struct {
 		M{"a": 123456e1},
 	}, {
 		"a: 123456E1\n",
-		M{"a": 123456E1},
+		M{"a": 123456e1},
 	},
 	// yaml-test-suite 3GZX: Spec Example 7.1. Alias Nodes
 	{