Update github checkout and cache actions to v4.

Author: iliekturtles

.github/workflows/ci-full-test-suite.yml

@@ -10,15 +10,15 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Rust toolchain
         id: install-rust
         uses: dtolnay/rust-toolchain@stable
 
       # Cache based on OS/compiler.
       - name: Extract cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cargo

.github/workflows/ci-min-test-matrix.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@master

.github/workflows/ci-tool-checks.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Rust nightly toolchain
         uses: dtolnay/rust-toolchain@nightly
@@ -27,7 +27,7 @@ jobs:
 
       # Tools-specific cache based on OS/compiler.
       - name: Extract tools cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cargo