fix: rubocop config fixes

Fixes based on [failures](https://github.com/procore-oss/ruby-sdk/actions/runs/14200642357/job/39786502330?pr=81#step:6:5)

There is also a warning when you run `COVERAGE=true bundle exec rake` about many new cops available.  That's for another PR

- [x] added .tool-versions (asdf) to gitignore

Signed-off-by: jmeridth <[email protected]>

Author: jmeridth

.gitignore

@@ -1,5 +1,7 @@
 .yardopts
 
+.tool-versions
+
 /.bundle/
 /.yardoc
 /Gemfile.lock