Fix the test using bufbuild/buf-setup-action

[rdimitrov]

We have a test where frizbee resolves the digest behind bufbuild/buf-setup-action@v1.

The test case is to ensure that frizbee can resolve actions tagged by their major versions to the latest released minor/patch version, i.e. v1.29.1.

This works okay, but the buf action updates frequently which breaks the tests for frizbee. What we should do instead is find or perhaps release our own test action that we can use instead of the buf action. We can release several minor versions under the v1 tag and use their digest instead in the tests ensuring frizbee resolves to the latest minor version of v1.