Fix unsetting frozen and deployment on newer bundler versions

deployment flag must be unset locally

packaging/addons/openproject/bin/postinstall

@@ -15,10 +15,10 @@ custom_gemfile=$(${CLI} config:get CUSTOM_PLUGIN_GEMFILE || echo "")
 if [ -n "$custom_gemfile" ] && [ -f "$custom_gemfile" ]; then
 
         # Need to override the frozen setting for the vendored gems
-        ${CLI} run bundle config --local frozen 0
+        ${CLI} run bundle config set --local frozen 'false'
 
         # Unset deployment, allowing changes to the Gemfile
-        ${CLI} run bundle config unset deployment
+        ${CLI} run bundle config set --local deployment 'false'
 
         # Re-bundle the application including gems
         ${CLI} run bundle install