Upgrade gitea to at least 1.17.2

[robe]

We are current on 1.16.7.

Note too many changes in 1.17, key things I care about are ​https://github.com/go-gitea/gitea/releases/tag/v1.17.0

• Automatically render wiki TOC
• Add "Allow edits from maintainer" feature
• Add LDAP group sync to Teams #may not be useful since it's easier to add people to gitea groups than our ldap interface
• Find files in repo
• Lots of UI mobile improvements

Possible breaking changes ​https://github.com/go-gitea/gitea/releases/tag/v1.17.0

• Require git > 2.0 not a concern since we are running higher
• change git default branch from master to main (I am assuming this is just for new repos)

[robe]

Done on both dev and prod