pin ruby to latest codebuild version

cat5inthecradle · cat5inthecradle · commit c1a76f5fa147 · 2022-06-17T12:49:47.000-05:00
diff --git a/.ruby-version b/.ruby-version
@@ -1 +1 @@
-2.7.2
+2.7.6
diff --git a/cicd/3-app/javabuilder/pr-buildspec.yml b/cicd/3-app/javabuilder/pr-buildspec.yml
@@ -7,7 +7,7 @@ phases:
       python: 3.8
     commands:
       - rbenv versions
-      # downgrade from default codebuild ruby runtime to the version we specify in .ruby-version
+      # downgrade from default codebuild ruby runtime to the version we specify in .ruby-version, if different
       - rbenv install -s
       - ruby -v
       - gem install bundler
