Fix phpcs filename

Author: tacxou

.github/workflows/static-code-analysis.yml

@@ -9,4 +9,4 @@ jobs:
               with:
                   fetch-depth: 1
             - name: Run PHP_CodeSniffer
-              run: docker run --rm -v $(pwd):/data cytopia/phpcs --standard=./phpcs.xml
+              run: docker run --rm -v $(pwd):/data cytopia/phpcs --standard=./phpcs.xml.dist