chore: cancel previous GHA from the same PR (#162)

Author: gregmagolan

.github/workflows/default.yaml

@@ -10,6 +10,11 @@ on:
   # Allows manually triggering this workflow from the Actions tab.
   workflow_dispatch:
 
+concurrency:
+  # Cancel previous actions from the same PR: https://stackoverflow.com/a/72408109
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   distros:
     strategy:
@@ -19,7 +24,7 @@ jobs:
           - ubuntu-22.04
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Test
         run: |
@@ -36,7 +41,7 @@ jobs:
           - opt
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Test
         run: |
@@ -54,7 +59,7 @@ jobs:
           - ubsan
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Test ${{ matrix.sanitizer }}
         run: |
@@ -65,7 +70,7 @@ jobs:
   coverage:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Test Coverage
         run: |
@@ -82,7 +87,7 @@ jobs:
           - macos-11
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Test with RBE
         run: |