Use strings.SplitSeq in lineWithPrefix (modernize lint)

Range over strings.SplitSeq instead of strings.Split: the seq variant
iterates without allocating the intermediate slice, clearing the
golangci-lint modernize/stringsseq finding.

Co-authored-by: Isaac

Author: rugpanov

libs/localenv/uv.go

@@ -171,7 +171,7 @@ const (
 // lineWithPrefix returns the trimmed remainder of the first line in out that
 // starts with prefix, and whether such a line was found.
 func lineWithPrefix(out, prefix string) (string, bool) {
-	for _, line := range strings.Split(out, "\n") {
+	for line := range strings.SplitSeq(out, "\n") {
 		line = strings.TrimSpace(line)
 		if after, ok := strings.CutPrefix(line, prefix); ok {
 			return strings.TrimSpace(after), true