[brotli/go] Add missing importpath BUILD.bazel

Otherwise the package cannot be imported correctly in open source. This CL allows the brotli and cbrotli tests to pass correctly with bazel (open-source version of blaze).

PiperOrigin-RevId: 772904736

go/brotli/BUILD.bazel

diff --git a/go/brotli/BUILD.bazel b/go/brotli/BUILD.bazel
index 8083211..522d9e4 100644
--- a/go/brotli/BUILD.bazel
+++ b/go/brotli/BUILD.bazel
@@ -10,6 +10,7 @@
         "decode.go",
         "reader.go",
     ],
+    importpath = "github.com/google/brotli/go/brotli",
 )
 
 go_test(