chore: optimize test-coverage-improver workflow for token efficiency

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/37fb82aa-b951-4d52-89ab-d7e3f355d8ad

Author: Copilot

.github/aw/actions-lock.json

@@ -55,16 +55,6 @@
       "version": "v4.0.0",
       "sha": "4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd"
     },
-    "github/gh-aw-actions/setup-cli@v0.71.1": {
-      "repo": "github/gh-aw-actions/setup-cli",
-      "version": "v0.71.1",
-      "sha": "239aec45b78c8799417efdd5bc6d8cc036629ec1"
-    },
-    "github/gh-aw-actions/setup@v0.71.1": {
-      "repo": "github/gh-aw-actions/setup",
-      "version": "v0.71.1",
-      "sha": "239aec45b78c8799417efdd5bc6d8cc036629ec1"
-    },
     "github/gh-aw/actions/setup@v0.69.3": {
       "repo": "github/gh-aw/actions/setup",
       "version": "v0.69.3",