Update validate.yml

Author: GrahamCampbell

.github/workflows/validate.yml

@@ -68,19 +68,19 @@ jobs:
         # Workaround taken from https://github.com/actions/runner/issues/241#issuecomment-577360161
         run: script -e -c "npm test -- -b"
         env:
-          SLS_AWS_SDK_V3: "0"
+          SLS_AWS_SDK_V3: '0'
       - name: Unit tests (AWS SDK v3)
         run: script -e -c "npm test -- -b"
         env:
-          SLS_AWS_SDK_V3: "1"
+          SLS_AWS_SDK_V3: '1'
       - name: Packaging tests (AWS SDK v2)
         run: npm run integration-test-run-package
         env:
-          SLS_AWS_SDK_V3: "0"
+          SLS_AWS_SDK_V3: '0'
       - name: Packaging tests (AWS SDK v3)
         run: npm run integration-test-run-package
         env:
-          SLS_AWS_SDK_V3: "1"
+          SLS_AWS_SDK_V3: '1'
 
   windowsNode16:
     name: '[Windows] Node 16: Unit tests'