[chore]: Bump github.com/jackc/pgx/v5 from 5.7.3 to 5.7.4 (#4002)

Bumps [github.com/jackc/pgx/v5](https://github.com/jackc/pgx) from 5.7.3 to 5.7.4.
- [Changelog](https://github.com/jackc/pgx/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jackc/pgx/compare/v5.7.3...v5.7.4)

---
updated-dependencies:
- dependency-name: github.com/jackc/pgx/v5
  dependency-version: 5.7.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

vendor/github.com/jackc/pgx/v5/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 5.7.4 (March 24, 2025)
+
+* Fix / revert change to scanning JSON `null` (Felix Röhrich)
+
 # 5.7.3 (March 21, 2025)
 
 * Expose EmptyAcquireWaitTime in pgxpool.Stat (vamshiaruru32)

vendor/github.com/jackc/pgx/v5/pgtype/json.go

@@ -197,7 +197,7 @@ type scanPlanJSONToJSONUnmarshal struct {
 }
 
 func (s *scanPlanJSONToJSONUnmarshal) Scan(src []byte, dst any) error {
-	if src == nil || string(src) == "null" {
+	if src == nil {
 		dstValue := reflect.ValueOf(dst)
 		if dstValue.Kind() == reflect.Ptr {
 			el := dstValue.Elem()