feat: bump the minimum required Git version from 2.0.0 to 2.34.1 (#8328)

- Resolves forgejo/discussions#324
- Remove all checks of `CheckGitVersionAtLeast` that checked for a version below 2.34.1
- The version was chosen because Debian stable supports 2.39.5 and Ubuntu 22.04 LTS supports 2.34.1

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8328
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

routers/web/misc/misc.go

@@ -7,7 +7,6 @@ import (
 	"net/http"
 	"path"
 
-	"forgejo.org/modules/git"
 	"forgejo.org/modules/httpcache"
 	"forgejo.org/modules/log"
 	"forgejo.org/modules/setting"
@@ -15,10 +14,6 @@ import (
 )
 
 func SSHInfo(rw http.ResponseWriter, req *http.Request) {
-	if !git.SupportProcReceive {
-		rw.WriteHeader(http.StatusNotFound)
-		return
-	}
 	rw.Header().Set("content-type", "text/json;charset=UTF-8")
 	_, err := rw.Write([]byte(`{"type":"agit","version":1}`))
 	if err != nil {