Update Prometheus client

Changelog for 0.2.1-rc1:

• PR #8 update prometheus client golang. fixes CVE-2022-21698 by @spawn2kill

Commits
ffa4eae Add publish permissions by @alexellis
e2ecb21 Update build step to local only by @alexellis
f9988df Update Makefile for gofmt target by @alexellis
8d7eabf Fix gofmt and ensure it ignores the vendor folder. by @alexellis
d2e0504 update prometheus client golang by @spawn2kill
a3dd23c Populate repo owner and name in GitHub Actions by @alexellis
b05240d Update GHCR authentication in actions and Go to 1.17 by @alexellis
1cf0c67 Update README.md by @alexellis

Changes: 0.2.0...0.2.1-rc1

Generated by Derek