Add concurrency to workflows

Author: gastaldi

.github/workflows/codeql-analysis.yml

@@ -18,6 +18,10 @@ on:
     # The branches below must be a subset of the branches above
     branches: [ "master" ]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   analyze:
     name: Analyze

.github/workflows/maven.yml

@@ -8,6 +8,10 @@ on:
     branches:
     - master
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   Build:
     strategy: