Remove some leftovers after Rails 7.0 upgrade

config/application.rb

@@ -104,10 +104,6 @@ class Application < Rails::Application
     # Make Ruby preserve the timezone of the receiver when calling `to_time`.
     config.active_support.to_time_preserves_timezone = false
 
-    # Use a modern approved hashing function.
-    # This is the default in Rails 7.0, so can be removed when we upgrade.
-    config.active_support.hash_digest_class = OpenSSL::Digest::SHA256
-
     # Applying the patch for CVE-2022-32224 broke YAML deserialization because some classes are disallowed in the serialized YAML
     config.active_record.yaml_column_permitted_classes = [Symbol, Time, Date, BigDecimal, OpenStruct,
                                                           ActionController::Parameters,

openshift/system/Dockerfile

@@ -22,7 +22,7 @@ RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* \
     && bundle install --jobs $(grep -c processor /proc/cpuinfo) --retry=5 \
     && npm install -g yarn \
     && yarn install:safe --no-progress \
-    # TODO: update to SECRET_KEY_BASE_DUMMY=1 when we upgrade to Rails 7.0
+    # TODO: update to SECRET_KEY_BASE_DUMMY=1 when we upgrade to Rails 7.1
     && SECRET_KEY_BASE=rails/32947 bundle exec rake assets:precompile tmp:clear \
     && rm -rf node_modules /usr/local/share/gems/cache /usr/local/share/gems/doc
 
@@ -105,7 +105,7 @@ ENV THINKING_SPHINX_ADDRESS=0.0.0.0 \
     THINKING_SPHINX_QUERY_LOG=/dev/stdout \
     THINKING_SPHINX_LOG=/dev/stdout \
     RAILS_ENV=production \
-    # TODO: update to SECRET_KEY_BASE_DUMMY=1 when we upgrade to Rails 7.0
+    # TODO: update to SECRET_KEY_BASE_DUMMY=1 when we upgrade to Rails 7.1
     SECRET_KEY_BASE=dummy \
     DATABASE_URL='mysql2://root:@localhost/porta'
 USER 0