Update actions

Author: MattiasBuelens

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install stable Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install stable Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with: