Publish workflow doesn't allow numbers in package names

I noticed that when tagging json_rpc_2-v4.0.0 it didn't get published, and it looks like its because the regex for tags only allows `[A-z]` for the package name, but numbers are also valid in package names.

This regex also might be too permissive in that it allows `[`, `\`, `]`, `^`, and "`"
