Update to be able to run on 3.4 with frozen strings (#1080)

* Update to be able to run on 3.4 with frozen strings

---------

Co-authored-by: Jeremy Daer <jeremydaer@gmail.com>
Co-authored-by: Sijawusz Pur Rahnama <sija@sija.pl>

.github/workflows/ci.yml

@@ -27,6 +27,7 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4.0-preview2"
         gemfile:
           - Gemfile
           - gemfiles/rails_edge.gemfile
@@ -41,6 +42,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Remove gemfile.lock
+        run: rm Gemfile.lock
+
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -49,3 +53,5 @@ jobs:
 
       - name: Run tests
         run: bin/test
+        env:
+          RUBYOPT: ${{ startsWith(matrix.ruby-version, '3.4.') && '--enable=frozen-string-literal' || '' }}