Update workflow version

Author: JamesDPC

.github/workflows/ci.yml

@@ -6,8 +6,8 @@ on:
 jobs:
   Silverstripe:
     name: 'Silverstripe (bundle)'
-    uses: nswdpc/ci-files/.github/workflows/silverstripe_53_83.yml@v-3
+    uses: nswdpc/ci-files/.github/workflows/silverstripe_53_83.yml@v-4
   PHPStan:
     name: 'PHPStan (analyse)'
-    uses: nswdpc/ci-files/.github/workflows/phpstan.silverstripe_83.yml@v-3
+    uses: nswdpc/ci-files/.github/workflows/phpstan.silverstripe_83.yml@v-4
     needs: Silverstripe