[v15.0/forgejo]: chore: add modernizer linter (#11949)

**Backport: !11936**

- Go has a suite of small linters that helps with modernizing Go code by using newer functions and catching small mistakes, https://pkg.go.dev/golang.org/x/tools/go/analysis/passes/modernize.
- Enable this linter in golangci-lint.
- There's also [`go fix`](https://go.dev/blog/gofix), which is not yet released as a linter in golangci-lint: https://github.com/golangci/golangci-lint/pull/6385

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11949
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

modules/git/commit_info.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"maps"
 	"path"
 	"sort"
 
@@ -45,9 +46,7 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 				return nil, nil, err
 			}
 
-			for pth, found := range commits {
-				revs[pth] = found
-			}
+			maps.Copy(revs, commits)
 		}
 	} else {
 		sort.Strings(entryPaths)