[ci] Update the legacy analysis versions (#5699)

Author: stuartmorgan-g

.cirrus.yml

@@ -157,11 +157,10 @@ task:
       depends_on: analyze
       env:
         matrix:
-          CHANNEL: "2.5.3"
+          CHANNEL: "2.10.5"
           CHANNEL: "2.8.1"
       analyze_script:
         - ./script/tool_runner.sh analyze --skip-if-not-supporting-flutter-version="$CHANNEL" --custom-analysis=script/configs/custom_analysis.yaml
-        - echo "If this test fails, the minumum Flutter version should be updated"
     - name: readme_excerpts
       env:
         CIRRUS_CLONE_SUBMODULES: true