[CHORE] Update connect-go to maintained fork

- Update github.com/bufbuild/connect-go to
https://github.com/connectrpc/connect-go.
- This is a fork that's actively maintained and is recommend by the
original library. Looking at the recent release notes, it looks like
going in the right direction what one would expect of a library, no
strange features being added, lots of improvements.
- There's still an indirect dependency by
`code.gitea.io/actions-proto-go` on a old version of `connect-go`.

go.mod

@@ -3,10 +3,11 @@ module code.gitea.io/gitea
 go 1.21
 
 require (
-	code.gitea.io/actions-proto-go v0.3.1
+	code.gitea.io/actions-proto-go v0.4.0
 	code.gitea.io/gitea-vet v0.2.3
 	code.gitea.io/sdk/gitea v0.17.1
 	codeberg.org/gusted/mcaptcha v0.0.0-20220723083913-4f3072e1d570
+	connectrpc.com/connect v1.15.0
 	gitea.com/go-chi/binding v0.0.0-20230415142243-04b515c6d669
 	gitea.com/go-chi/cache v0.2.0
 	gitea.com/go-chi/captcha v0.0.0-20230415143339-2c0754df4384
@@ -19,7 +20,6 @@ require (
 	github.com/alecthomas/chroma/v2 v2.12.0
 	github.com/blakesmith/ar v0.0.0-20190502131153-809d4375e1fb
 	github.com/blevesearch/bleve/v2 v2.3.10
-	github.com/bufbuild/connect-go v1.10.0
 	github.com/buildkite/terminal-to-html/v3 v3.10.1
 	github.com/caddyserver/certmagic v0.20.0
 	github.com/chi-middleware/proxy v1.1.1
@@ -101,11 +101,11 @@ require (
 	github.com/yuin/goldmark v1.6.0
 	github.com/yuin/goldmark-highlighting/v2 v2.0.0-20230729083705-37449abec8cc
 	github.com/yuin/goldmark-meta v1.1.0
-	golang.org/x/crypto v0.18.0
+	golang.org/x/crypto v0.19.0
 	golang.org/x/image v0.15.0
-	golang.org/x/net v0.20.0
+	golang.org/x/net v0.21.0
 	golang.org/x/oauth2 v0.16.0
-	golang.org/x/sys v0.16.0
+	golang.org/x/sys v0.17.0
 	golang.org/x/text v0.14.0
 	golang.org/x/tools v0.17.0
 	google.golang.org/grpc v1.60.1