Fix typo "runs-un" in GHA workflows (Case 171395)

Author: mpdude

.github/workflows/fix-cs-php.yml

@@ -9,7 +9,7 @@ name: Coding Standards
 jobs:
     open-pr-for-cs-violations:
         name: PHP-CS-Fixer
-        runs-un: ubuntu-22.04
+        runs-on: ubuntu-22.04
         if: github.actor != 'dependabot[bot]'
         steps:
             -   name: Checkout code

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ env:
 
 jobs:
     PHPUnit:
-        runs-un: ubuntu-22.04
+        runs-on: ubuntu-22.04
         strategy:
             fail-fast: false
             matrix: