upgrade to checkout@v4

Author: sam0x17

.github/workflows/check-rust.yml

@@ -56,7 +56,7 @@ jobs:
       TARGET: ${{ matrix.rust-target }}
     steps:
       - name: Check-out repository under $GITHUB_WORKSPACE
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: sudo apt-get update && sudo apt-get install -y build-essential
@@ -98,7 +98,7 @@ jobs:
       TARGET: ${{ matrix.rust-target }}
     steps:
       - name: Check-out repository under $GITHUB_WORKSPACE
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |
@@ -147,7 +147,7 @@ jobs:
       TARGET: ${{ matrix.rust-target }}
     steps:
       - name: Check-out repository under $GITHUB_WORKSPACE
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |
@@ -196,7 +196,7 @@ jobs:
       TARGET: ${{ matrix.rust-target }}
     steps:
       - name: Check-out repository under $GITHUB_WORKSPACE
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |
@@ -245,7 +245,7 @@ jobs:
       TARGET: ${{ matrix.rust-target }}
     steps:
       - name: Check-out repository under $GITHUB_WORKSPACE
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |
@@ -299,7 +299,7 @@ jobs:
       TARGET: ${{ matrix.rust-target }}
     steps:
       - name: Check-out repository under $GITHUB_WORKSPACE
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |
@@ -346,7 +346,7 @@ jobs:
         run: cargo install --locked -q zepter && zepter --version
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # Dont clone historic commits.