Set ruby to 2.7.7 again

.circleci/config.yml

@@ -87,7 +87,6 @@ commands:
       - run:
           name: Install ruby
           command: |
-            echo "ruby-2.7.7" > ~/.ruby-version
             if [ -d ~/.rbenv/versions/2.7.7 ]; then
               echo "Ruby already installed"
             else

.ruby-version

@@ -0,0 +1 @@
+2.7.7

ios/Gemfile

@@ -1,7 +1,5 @@
 source "https://rubygems.org"
 
-ruby ">= 2.6.10"
-
 gem 'fastlane'
 gem 'cocoapods', '>= 1.13', '< 1.15'
 gem 'activesupport', '>= 6.1.7.5', '< 7.1.0'