Fix BC checker (#39)

.github/workflows/bc.yml

@@ -1,15 +1,14 @@
 on:
-    - pull_request
-    - push
+  - pull_request
+  - push
 
 name: backwards compatibility
+
 jobs:
-    roave_bc_check:
-        name: Roave BC Check
-        runs-on: ubuntu-latest
-        steps:
-            - uses: actions/checkout@master
-            - name: fetch tags
-              run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
-            - name: Roave BC Check
-              uses: docker://nyholm/roave-bc-check-ga
+  roave_bc_check:
+    uses: yiisoft/actions/.github/workflows/bc.yml@master
+    with:
+      os: >-
+        ['ubuntu-latest']
+      php: >-
+        ['8.0']