Bump min phpcs version to 3.15.5 in GH actions

Author: sirbrillig

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
         #
         # The matrix is set up so as not to duplicate the builds which are run for code coverage.
         php: ["5.5", "5.6", "7.0", "7.1", "7.2", "7.3"]
-        phpcs_version: ["3.5.7", "4.0.0", "4.x-dev"]
+        phpcs_version: ["3.13.5", "4.0.0", "4.x-dev"]
 
         exclude:
           # PHPCS 4.x requires PHP 7.2+
@@ -61,32 +61,32 @@ jobs:
           - php: "8.5"
             phpcs_version: "4.0.0"
           - php: "8.5"
-            phpcs_version: "3.13.4"
+            phpcs_version: "3.13.5"
 
           - php: "8.4"
             phpcs_version: "4.x-dev"
           - php: "8.4"
-            phpcs_version: "3.6.1"
+            phpcs_version: "3.13.5"
 
           - php: "8.3"
             phpcs_version: "4.x-dev"
           - php: "8.3"
-            phpcs_version: "3.6.1"
+            phpcs_version: "3.13.5"
 
           - php: "8.2"
             phpcs_version: "4.x-dev"
           - php: "8.2"
-            phpcs_version: "3.6.1"
+            phpcs_version: "3.13.5"
 
           - php: "8.1"
             phpcs_version: "4.x-dev"
           - php: "8.1"
-            phpcs_version: "3.6.1"
+            phpcs_version: "3.13.5"
 
           - php: "8.0"
             phpcs_version: "4.x-dev"
           - php: "8.0"
-            phpcs_version: "3.5.7"
+            phpcs_version: "3.13.5"
 
           - php: "7.4"
             phpcs_version: "4.x-dev"
@@ -168,12 +168,12 @@ jobs:
           - php: "8.5"
             phpcs_version: "4.x-dev"
           - php: "7.4"
-            phpcs_version: "3.5.7"
+            phpcs_version: "3.13.5"
 
           - php: "7.2"
             phpcs_version: "4.x-dev"
           - php: "5.4"
-            phpcs_version: "3.5.7"
+            phpcs_version: "3.13.5"
 
     name: "Coverage: PHP ${{ matrix.php }} on PHPCS ${{ matrix.phpcs_version }}"