Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       matrix:
         os: [windows-2022, windows-2025]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: dtolnay/rust-toolchain@stable
 

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
     name: Publish to crates.io
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: dtolnay/rust-toolchain@stable