build: set concurrency on actions, per zizmor 1.16.0

Author: nedbat

.github/workflows/codeql-analysis.yml

@@ -25,6 +25,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: "${{ github.workflow }}-${{ github.ref }}"
+  cancel-in-progress: true
+
 jobs:
   analyze:
     name: Analyze

.github/workflows/dependency-review.yml

@@ -17,6 +17,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: "${{ github.workflow }}-${{ github.ref }}"
+  cancel-in-progress: true
+
 jobs:
   dependency-review:
     name: "Review dependencies"