Revert "Add dependencies step to build-gems workflow, install libssl-…

…dev"

This reverts commit 8dc4565.

This was entirely wrong - the builds aren't taking place in the same
container as the action itself, so this doesn't do anything. Duh.

.github/workflows/build-gems.yml

@@ -35,10 +35,6 @@ jobs:
       matrix:
         ruby-platform: ${{ fromJSON(needs.ci-data.outputs.result).supported-ruby-platforms }}
     steps:
-      - name: Install dependencies
-        run: |
-          sudo apt-get install libssl-dev
-        shell: bash
       - uses: actions/checkout@v4
 
       - name: Set variables