Upgrade rubocop to 1.12.0

Co-authored-by: James Nebeker <jnebeker@users.noreply.github.com>
Co-authored-by: Aaron Kromer <cupakromer@users.noreply.github.com>
Co-authored-by: Sam Kim <sam-kim@users.noreply.github.com>
Co-authored-by: Alex Stone <alexstone@users.noreply.github.com>

common_rubocop.yml

@@ -196,6 +196,10 @@ Lint/HeredocMethodCallPosition:
 Lint/InheritException:
   EnforcedStyle: standard_error
 
+# Make developers explain themselves in a comment if they want their rescue block to do nothing.
+Lint/SuppressedException:
+  AllowNil: false
+
 # Often with benchmarking we don't explicitly "use" a variable or return value.
 # We simply need to perform the operation which generates said value for the
 # benchmark.
@@ -687,6 +691,10 @@ Style/SlicingWithRange:
 Style/StaticClass:
   Enabled: true
 
+# Enable Style/StringChars
+Style/StringChars:
+  Enabled: true
+
 # We generally prefer double quotes but many generators use single quotes. We
 # don't view the performance difference to be all that much so we don't care
 # if the style is mixed or double quotes are used for static strings.

radius-spec.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 2.5" # rubocop:disable Gemspec/RequiredRubyVersion
 
   spec.add_runtime_dependency "rspec", "~> 3.7"
-  spec.add_runtime_dependency "rubocop", "~> 1.11.0"
+  spec.add_runtime_dependency "rubocop", "~> 1.12.0"
   spec.add_runtime_dependency "rubocop-rails", "~> 2.12.0"
 
   spec.add_development_dependency "bundler", ">= 2.2.10"