Update to actions/checkout@v3

Author: cuviper

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
           profile: minimal
           override: true
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build
         uses: actions-rs/cargo@v1
         with:
@@ -42,7 +42,7 @@ jobs:
           override: true
           target: thumbv6m-none-eabi
       - name: Checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v3
       - name: Build
         uses: actions-rs/cargo@v1
         with:
@@ -61,7 +61,7 @@ jobs:
           override: true
           components: rustfmt
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Check formatting
         uses: actions-rs/cargo@v1
         with:

.github/workflows/master.yaml

@@ -22,7 +22,7 @@ jobs:
           profile: minimal
           override: true
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build
         uses: actions-rs/cargo@v1
         with:

.github/workflows/pr.yaml

@@ -18,7 +18,7 @@ jobs:
           profile: minimal
           override: true
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build
         uses: actions-rs/cargo@v1
         with:
@@ -38,7 +38,7 @@ jobs:
           override: true
           components: rustfmt
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Check formatting
         uses: actions-rs/cargo@v1
         with: