build(deps-dev): bump phpstan/phpstan in /tools/phpstan

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.1.38
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tools/phpstan/composer.json

@@ -3,7 +3,7 @@
   "description": "Flow PHP ETL - Tools",
   "require-dev": {
     "php": "~8.3.0 || ~8.4.0 || ~8.5.0",
-    "phpstan/phpstan": "2.1.33",
+    "phpstan/phpstan": "2.1.38",
     "spaze/phpstan-disallowed-calls": "^4.4"
   },
   "config": {