maint/CICD ~ temporarily disable failing tool cache for actionrs/install

# [why]

The tool cache is currently failing and seems to be getting further behind current
versions. The [actions-rs/install#12] issue addresses this but seems to be
languishing without any proposed solution.

[ref]: <actions-rs/install#12>

.github/workflows/CICD.yml

@@ -606,7 +606,7 @@ jobs:
       with:
         crate: grcov
         version: latest
-        use-tool-cache: true
+        use-tool-cache: false
     - name: Generate coverage data (via `grcov`)
       id: coverage
       shell: bash