[GITEA] Vendor rupture dependency

- The [rupture](https://github.com/ethantkoenig/rupture) dependency was
essentially outdated in the sense it was using old version of
dependencies.
- The usage by Forgejo was rather a small portion, so that portion is
now vendored (with its tests).
- Removes old dependencies from go.sum (less dependencies is better for
reviewing what the heck we're importing). Just to note that they were
likely not being used by Go's build process (according to
https://go.dev/ref/mod#minimal-version-selection), so it's really a
matter of formal cleaning up dependencies we don't use and therefor
don't want to download and be in our go.sum.

(cherry picked from commit aa72a5f009b5027b2324106343f91b466ba46293)

Conflicts:
	go.sum
	https://codeberg.org/forgejo/forgejo/pulls/2148
(cherry picked from commit fbe8d65f0b1836b2e771991b4d5d12f1bfa938ed)
(cherry picked from commit e18debcb6a9476f60d364e847265b4ac7fb76c8e)

Conflicts:
	go.sum
	https://codeberg.org/forgejo/forgejo/pulls/2245
(cherry picked from commit 8c43c2ada82102a0df44fd874c4f5fe3a36ef758)

go.mod

@@ -33,7 +33,6 @@ require (
 	github.com/editorconfig/editorconfig-core-go/v2 v2.6.0
 	github.com/emersion/go-imap v1.2.1
 	github.com/emirpasic/gods v1.18.1
-	github.com/ethantkoenig/rupture v1.0.1
 	github.com/felixge/fgprof v0.9.3
 	github.com/fsnotify/fsnotify v1.7.0
 	github.com/gliderlabs/ssh v0.3.6
@@ -206,6 +205,7 @@ require (
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/go-tpm v0.9.0 // indirect
+	github.com/gopherjs/gopherjs v0.0.0-20190910122728-9d188e94fb99 // indirect
 	github.com/gorilla/css v1.0.1 // indirect
 	github.com/gorilla/handlers v1.5.2 // indirect
 	github.com/gorilla/mux v1.8.1 // indirect