fix: github reproduction link validation (#61026)

### What?
In this PR #60988, I think (please correct me if I'm wrong) it was meant
to block GitHub reproduction links like `https://github.com/username` &
`https://github.com`. However, the last regex `github.com` will block
all the github.com links

### Why?
So that people can use a GithHb repo as reproduction link

### How?
Fix the regex, from `github.com` to `github.com$`

Co-authored-by: Steven <steven@ceriously.com>

.github/workflows/issue_validator.yml

@@ -30,7 +30,7 @@ jobs:
             }
           reproduction-comment: '.github/invalid-link.md'
           reproduction-hosts: 'github.com,codesandbox.io'
-          reproduction-blocklist: 'github.com/vercel/next.js.*,github.com/\\w*/?$,github.com'
+          reproduction-blocklist: 'github.com/vercel/next.js.*,github.com/\\w*/?$,github.com$'
           reproduction-link-section: '### Link to the code that reproduces this issue(.*)### To Reproduce'
           reproduction-invalid-label: 'invalid link'
           reproduction-issue-labels: 'template: bug'