Update actions/checkout action to v4

Author: taiki-e

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
         os: [ubuntu-latest]
         rust: [nightly, beta, stable]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
       - run: rustup target add thumbv7m-none-eabi
@@ -50,7 +50,7 @@ jobs:
       - name: Run cargo test (with valgrind)
         run: cargo test -- --test-threads=1
         env:
-          CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all
+          CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER: valgrind -v --error-exitcode=1 --error-limit=no --leak-check=full --show-leak-kinds=all --track-origins=yes --fair-sched=yes
       - name: Clone async-executor
         run: git clone https://github.com/smol-rs/async-executor.git
       - name: Add patch section
@@ -68,31 +68,31 @@ jobs:
         # Rust version in Cargo.toml.
         rust: ['1.47']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
       - run: cargo build
 
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update stable
       - run: cargo clippy --all-features --tests --examples
 
   fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update stable
       - run: cargo fmt --all --check
 
   miri:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup toolchain install nightly --component miri && rustup default nightly
       - run: cargo miri test
@@ -109,7 +109,7 @@ jobs:
       issues: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # https://github.com/rustsec/audit-check/issues/2
       - uses: rustsec/audit-check@master
         with:

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.repository_owner == 'smol-rs'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: taiki-e/create-gh-release-action@v1
         with:
           changelog: CHANGELOG.md