Bump actions/checkout from 4 to 7

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
         python: ["3.10", "3.12", "3.14"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v5
         with:
@@ -42,7 +42,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: actions/setup-python@v5
         with:
           python-version: "3.14"
@@ -73,7 +73,7 @@ jobs:
     continue-on-error: true
     timeout-minutes: 15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: actions/setup-python@v5
         with:
           python-version: "3.14"

.github/workflows/codeql.yml

@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3

.github/workflows/gam-watch.yml

@@ -27,7 +27,7 @@ jobs:
       contents: write        # push the bump branch
       pull-requests: write   # open the PR
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Is a newer GAM out?  # cheap check first — no download unless we're actually behind
         id: check