Bump actions/checkout from 6.0.2 to 6.0.3 (#62)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/reusable-testing.yml

@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: Check out source code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Check existence of composer.json & behat.yml files
         id: check_files