Limit concurrency of the SDK CI/CD workflows

Author: jverce

.github/workflows/pipedream-sdk-markdown-lint.yaml

@@ -6,6 +6,10 @@ on:
     paths:
       - 'packages/sdk/**/*.md'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest

.github/workflows/pipedream-sdk-test.yaml

@@ -6,6 +6,10 @@ on:
     paths:
       - 'packages/sdk/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest