Merge pull request #1665 from freeCodeCamp/renovate/ruby-2.x

Update dependency ruby to v2.7.5

.ruby-version

@@ -1 +1 @@
-2.7.4
+2.7.5

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7.4
+FROM ruby:2.7.5
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true