chore(deps): update actions/checkout action to v6.0.3

Author: renovate[bot]

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
     if: github.repository == 'testing-library/eslint-plugin-testing-library'
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Install pnpm
         uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8

.github/workflows/smoke-test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Install pnpm
         uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8

.github/workflows/verifications.yml

@@ -23,7 +23,7 @@ jobs:
           ]
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Install pnpm
         uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8
@@ -58,7 +58,7 @@ jobs:
             eslint: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Install pnpm
         uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8