Replace cancel-workflow action with native concurrency stanza

.github/workflows/docs.yml

@@ -6,6 +6,10 @@ on:
     tags:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   update_docs:
     name: Build and Deploy Documentation
@@ -14,11 +18,6 @@ jobs:
       run:
         shell: bash -l {0}
     steps:
-      - name: Cancel Previous Runs
-        uses: styfle/[email protected]
-        with:
-          access_token: ${{ github.token }}
-
       - name: Checkout
         uses: actions/checkout@v4
 

.github/workflows/test.yml

@@ -2,6 +2,10 @@ name:  Test Build
 
 on: workflow_dispatch
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     name: Tests on ${{ matrix.arch }} with Conda Python-${{ matrix.python }}
@@ -28,11 +32,6 @@ jobs:
             python: "3.11"
             arch: MacOSX-x86_64
     steps:
-      - name: Cancel Previous Runs
-        uses: styfle/[email protected]
-        with:
-          access_token: ${{ github.token }}
-
       - name: Checkout
         uses: actions/checkout@v4