Use latest checkout action version

Author: Kuuuube

.github/workflows/build_test.yml

@@ -13,7 +13,7 @@ jobs:
   build-windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup dependencies
         run: |
           rustup update stable

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup dependencies
         run: |
           rustup update stable