Remove security checker

It will report old TYPO3 versions which we support, but don't require.
Therefore it does not provide a benefit but breaks builds.
The package is intended for projects, not libraries.

.github/workflows/ci.yaml

@@ -236,30 +236,3 @@ jobs:
 
       - name: Code Quality (by PHPStan)
         run: ./vendor/bin/phpstan analyse
-
-  security-test:
-    runs-on: ubuntu-latest
-    needs: [check-dependencies]
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Get Composer Cache Directory
-        id: composer-cache
-        run: |
-            echo "::set-output name=dir::$(composer config cache-files-dir)"
-
-      - uses: actions/cache@v1
-        with:
-          path: ${{ steps.composer-cache.outputs.dir }}
-          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-composer-
-
-      - name: Keep composer V1 until all dev dependencies are ready
-        run: sudo composer selfupdate --1
-
-      - name: Install dependencies
-        run: composer install --prefer-dist --no-progress --no-suggest
-
-      - name: PHP Security test
-        run: ./vendor/bin/security-checker security:check --no-ansi

composer.json

@@ -47,8 +47,7 @@
         "maglnet/composer-require-checker": "^2.1",
         "phpspec/prophecy-phpunit": "^2.0",
         "typo3/testing-framework": "^6.3",
-        "saschaegerer/phpstan-typo3": "^0.13.1",
-        "sensiolabs/security-checker": "^6.0"
+        "saschaegerer/phpstan-typo3": "^0.13.1"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,