Adjust TYPO3 version in test matrix to use 13.1 instead of 13.0

Author: sascha-egerer

.github/workflows/tests.yml

@@ -60,16 +60,16 @@ jobs:
           - typo3-version: "^12.4"
             php-version: "8.3"
             composer-flags: " --prefer-lowest"
-          - typo3-version: "^13.0"
+          - typo3-version: "^13.1"
             php-version: "8.2"
             composer-flags: ""
-          - typo3-version: "^13.0"
+          - typo3-version: "^13.1"
             php-version: "8.2"
             composer-flags: " --prefer-lowest"
-          - typo3-version: "^13.0"
+          - typo3-version: "^13.1"
             php-version: "8.3"
             composer-flags: ""
-          - typo3-version: "^13.0"
+          - typo3-version: "^13.1"
             php-version: "8.3"
             composer-flags: " --prefer-lowest"