[Hotfix][ci] Fix github ci License header error (apache#7738)

Author: hawk9821

.github/workflows/backend.yml

@@ -34,7 +34,7 @@ jobs:
         with:
           submodules: true
       - name: Check license header
-        uses: apache/skywalking-eyes@985866ce7e324454f61e22eb2db2e998db09d6f3
+        uses: apache/skywalking-eyes@v0.5.0
 
   code-style:
     name: Code style

.licenserc.yaml

@@ -37,6 +37,7 @@ header:
     - '**/*.iml'
     - '**/*.ini'
     - '**/*.svg'
+    - '**/*.txt'
     - '**/.gitignore'
     - '**/LICENSE'
     - '**/NOTICE'