Merge older release patch to main

[devlinjunker]

Describe the Improvement:
Patch to non-current release branch should also be patched to main and most recent release-*

Use last gig tag (major/minor version) to determine most recent release-* branch

Should probably only create PRs to be manually merged (in case of conflicts)

Benefits:
Ensures main and most recent release have all patches

Drawbacks:
n/a

How to Compare:
Network graph should show line from older patch branch to most recent release branch (e.g. patch-1.5.8 to release-1.7

[devlinjunker]

example PR: #142 and #143