[CI] correct version of workflow

Author: jaapio

.github/workflows/integrate.yaml

@@ -46,6 +46,6 @@ jobs:
 
  unit-tests:
  name: "Unit test"
- uses: "phpDocumentor/.github/.github/workflows/continuous-integration.yml@0.5.0"
+ uses: "phpDocumentor/.github/.github/workflows/continuous-integration.yml@v0.5.0"
  with:
  composer-root-version: "1.x-dev"