Update actions/checkout action to v7 (#34)

Author: renovate[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
 
         steps:
           - name: Checkout
-            uses: actions/checkout@v6    
+            uses: actions/checkout@v7    
           - name: Cache cargo
             uses: ./.github/actions/cache_cargo
           - name: build
@@ -24,7 +24,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
             - name: Setup Rust-toolchain
               uses: dtolnay/rust-toolchain@stable
               with:
@@ -39,7 +39,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
             - name: Setup Rust-toolchain
               uses: dtolnay/rust-toolchain@stable
               with: