chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
           - relay/relay-api
           - relay/relay-auth
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v4
         with:
           node-version: 20

.github/workflows/publish-pkg-canary.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout code 🛎️
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           ref: ${{ github.event.inputs.branch }}
           # Fetch all history so npm version can determine versions correctly

.github/workflows/publish-pkg-latest.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout code 🛎️
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           ref: master # Publish only from master branch
           # Fetch all history so npm version can determine versions correctly (though not setting version here)