chore(deps): update actions/checkout action to v6

Author: nextest-bot

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt, clippy
@@ -44,7 +44,7 @@ jobs:
         os: [ubuntu-latest]
       fail-fast: false
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt, clippy
@@ -63,7 +63,7 @@ jobs:
         rust-version: ["1.72", stable]
       fail-fast: false
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust-version }}

.github/workflows/coverage.yml

@@ -18,7 +18,7 @@ jobs:
       RUSTFLAGS: -D warnings
       CARGO_TERM_COLOR: always
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
         # Nightly Rust is used for cargo llvm-cov --doc below.
       - uses: dtolnay/rust-toolchain@nightly
         with:

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
     concurrency: ci-${{ github.ref }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: taiki-e/install-action@just
       - name: Build rustdoc

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     if: github.repository_owner == 'nextest-rs' && startsWith(github.ref_name, 'datatest-stable-')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
         with:
           persist-credentials: false
       - name: Install Rust