Update GitHub Actions for release process

BLD: update changelog and release artifacts from make run

Updates commit/issue counts (632→704 commits, 357→363 issues), adds giddy v2.3.9
entries, and refreshes frozen.txt and releases.p.

REL: v26.01

Adding gwlearn

RC: 25.07rc2

Fix nb links in index page

Merge pull request #1371 from sjsrey/ghactions

Correct pypi push action