checkout pr branch code for testing

Author: jdkent

.github/workflows/testing.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches:
       - "master"
-  pull_request_target:
+  pull_request:
     branches:
       - "*"
   schedule:
@@ -27,7 +27,7 @@ jobs:
     outputs:
       skip: ${{ steps.result_step.outputs.ci-skip }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - id: result_step
@@ -51,7 +51,7 @@ jobs:
       run:
         shell: bash
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: "Set up python"
         uses: actions/setup-python@v2
         with:
@@ -74,7 +74,7 @@ jobs:
     name: Lint with flake8
     steps:
       - name: Check out source repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up Python environment
         uses: actions/setup-python@v2