Bump actions/checkout from 2 to 7

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy, rustfmt
@@ -36,7 +36,7 @@ jobs:
   msrv:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: dtolnay/rust-toolchain@1.88.0
       # Dev-dependencies routinely need a newer compiler than the library does, so the
       # promise is checked against the library and its public API, not the test suite.
@@ -51,7 +51,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: dtolnay/rust-toolchain@stable
       - name: Install cargo-audit
         run: cargo install cargo-audit --locked

.github/workflows/publish.yml

@@ -8,7 +8,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v7
     - uses: actions-rs/toolchain@v1
       with:
         toolchain: stable