workflows: Disable cache for inspircd + add version flavor to the cache key for others

.github/workflows/test-devel_release.yml

@@ -25,13 +25,6 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: 3.7
-    - name: Cache dependencies
-      uses: actions/cache@v2
-      with:
-        key: ${{ runner.os }}-inspircd
-        path: |-
-          ~/.cache
-          $GITHUB_WORKSPACE/inspircd
     - name: Install dependencies
       run: |-
         sudo apt-get install atheme-services