Update actions/checkout digest to 6d193bf

Author: renovate[bot]

.github/workflows/rust.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     # actions/checkout@v2
-    - uses: actions/checkout@9a9194f87191a7e9055e3e9b95b8cfb13023bb08
+    - uses: actions/checkout@6d193bf28034eafb982f37bd894289fe649468fc
     - uses: actions-rs/toolchain@88dc2356392166efad76775c878094f4e83ff746
       with:
         toolchain: stable
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     # actions/checkout@v2
-    - uses: actions/checkout@9a9194f87191a7e9055e3e9b95b8cfb13023bb08
+    - uses: actions/checkout@6d193bf28034eafb982f37bd894289fe649468fc
     - name: Cargo check
       run: cargo check --no-default-features
 
@@ -38,7 +38,7 @@ jobs:
         os: [ ubuntu-latest, macos-12 ]
     steps:
     # actions/checkout@v2
-    - uses: actions/checkout@9a9194f87191a7e9055e3e9b95b8cfb13023bb08
+    - uses: actions/checkout@6d193bf28034eafb982f37bd894289fe649468fc
     - name: Build
       run: cargo build --tests --verbose
     - name: Run tests