CI: Use flatpak-builder-lint from the image

The images provided by Flathub already contain flatpak-builder-lint,
and it's up-to-date.

.github/actions/flatpak-builder-lint/action.yaml

@@ -33,23 +33,6 @@ runs:
             ;;
         esac
 
-    - uses: actions/checkout@v4
-      with:
-        repository: flathub/flatpak-builder-lint
-        ref: v2.0.13
-        path: flatpak-builder-lint
-        set-safe-directory: ${{ inputs.workingDirectory }}
-
-    - name: Install Dependencies 🛍️
-      shell: bash
-      working-directory: ${{ inputs.workingDirectory }}
-      run: |
-        : Install Dependencies 🛍️
-        echo ::group::Install Dependencies
-        dnf install -y -q poetry jq
-        poetry -q -C flatpak-builder-lint install
-        echo ::endgroup::
-
     - name: Run flatpak-builder-lint
       id: result
       shell: bash
@@ -57,7 +40,7 @@ runs:
       run: |
         : Run flatpak-builder-lint
         exit_code=0
-        ret=$(poetry -C flatpak-builder-lint run flatpak-builder-lint --exceptions ${{ inputs.artifact }} ${{ inputs.path }}) || exit_code=$?
+        ret=$(flatpak-builder-lint --exceptions ${{ inputs.artifact }} ${{ inputs.path }}) || exit_code=$?
         if [[ $exit_code != 0 && -z "$ret" ]]; then
           echo "::error::Error while running flatpak-builder-lint"
           exit 2