CI: disable cacheing - unreliable

Warning: Cache service responded with 429 during upload chunk.
/home/runner/work/_actions/actions/cache/v2/dist/save/index.js:3305
                        throw new Error(`Cache upload failed because file read failed with ${error.message}`);
                        ^

Error: Cache upload failed because file read failed with EBADF: bad file descriptor, read
    at ReadStream.<anonymous> (/home/runner/work/_actions/actions/cache/v2/dist/save/index.js:3305:31)
    at ReadStream.emit (events.js:210:5)
    at internal/fs/streams.js:167:12
    at FSReqCallback.wrapper [as oncomplete] (fs.js:470:5)

.github/workflows/packages.yml

@@ -29,18 +29,6 @@ jobs:
         sudo apt purge -yq $(dpkg -l | grep '^ii' | awk '{ print $2 }' | grep -P '(cabal-|dotnet-|ghc-|libmono|php)') \
           liblldb-6.0 libllvm6.0:amd64 mono-runtime-common monodoc-manual powershell ruby
         sudo apt autoremove -yq
-    - name: Prebuilt dependencies cache
-      uses: actions/cache@v2
-      with:
-        path: |
-          .termux-builder/_cache-all
-          .termux-builder/_cache-aarch64
-          .termux-builder/_cache-arm
-          .termux-builder/_cache-i686
-          .termux-builder/_cache-x86_64
-        key: debfiles-${{ matrix.target_arch }}-${{ hashFiles('**/build.sh') }}-
-        restore-keys: |
-          debfiles-${{ matrix.target_arch }}-
     - name: Build
       run: |
         BASE_COMMIT=$(jq --raw-output .pull_request.base.sha "$GITHUB_EVENT_PATH")