Change PHP version GitHub Action (GHA) matrix to string.

Author: Potherca

.github/workflows/php.yml

@@ -93,12 +93,12 @@ jobs:
       fail-fast: false
       matrix:
         php:
-          - 8.0  # from 2020-11 to 2022-11 (2023-11)
-          - 8.1  # from 2021-11 to 2023-11 (2025-12)
-          - 8.2  # from 2022-12 to 2024-12 (2026-12)
-          - 8.3  # from 2023-11 to 2025-12 (2027-12)
-          - 8.4  # from 2024-11 to 2026-12 (2028-12)
-          - 8.5  # from 2025-11 to 2027-12 (2029-12)
+          - '8.0'  # from 2020-11 to 2022-11 (2023-11)
+          - '8.1'  # from 2021-11 to 2023-11 (2025-12)
+          - '8.2'  # from 2022-12 to 2024-12 (2026-12)
+          - '8.3'  # from 2023-11 to 2025-12 (2027-12)
+          - '8.4'  # from 2024-11 to 2026-12 (2028-12)
+          - '8.5'  # from 2025-11 to 2027-12 (2029-12)
     steps:
       - uses: actions/checkout@v4
       - uses: docker://pipelinecomponents/php-codesniffer