Add golang to tool-versions for rspec tests

What does this MR do and why?

It seems that rspec tests need golang installed, this MR adds golang to .tool-versions

before:

% bin/rspec spec/features/calendar_spec.rb
/Users/jamesrushford/.asdf/installs/ruby/3.2.3/lib/ruby/gems/3.2.0/gems/io-event-1.6.5/lib/io/event/support.rb:27: warning: IO::Buffer is experimental and both the Ruby and C interface may change in the future!
warning: parser/current is loading parser/ruby32, which recognizes 3.2.4-compliant syntax, but you are running 3.2.3.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}
### Building gitlab-resize-image
go build -ldflags "-X main.Version=11-10-0cfa69752d8-74ffd66ae-ee-279004-g4deb1d47b8d0 -X main.BuildTime=20240719.154818" -tags "tracer_static tracer_static_jaeger continuous_profiler_stackdriver" -o /Users/jamesrushford/Documents/gitlab-development-kit/gitlab/workhorse/gitlab-resize-image gitlab.com/gitlab-org/gitlab/workhorse/cmd/gitlab-resize-image
No go executable found for golang 1.22.5
make: *** [gitlab-resize-image] Error 2

An error occurred in a `before(:suite)` hook.
Failure/Error: raise 'workhorse make failed'

RuntimeError:
  workhorse make failed
# ./lib/gitlab/setup_helper.rb:58:in `compile_into'
# ./spec/support/helpers/test_env.rb:231:in `setup_workhorse'
# ./spec/support/helpers/test_env.rb:159:in `public_send'
# ./spec/support/helpers/test_env.rb:159:in `block in init'
# ./spec/support/helpers/test_env.rb:158:in `init'
# ./spec/spec_helper.rb:235:in `block (2 levels) in <top (required)>'


Finished in 2.98 seconds (files took 14.46 seconds to load)
0 examples, 0 failures, 1 error occurred outside of examples

after:

% bin/rspec spec/features/calendar_spec.rb                        
/Users/jamesrushford/.asdf/installs/ruby/3.2.3/lib/ruby/gems/3.2.0/gems/io-event-1.6.5/lib/io/event/support.rb:27: warning: IO::Buffer is experimental and both the Ruby and C interface may change in the future!
warning: parser/current is loading parser/ruby32, which recognizes 3.2.4-compliant syntax, but you are running 3.2.3.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}
==> GitLab Workhorse set up in 51.866212 seconds...

Test environment set up in 53.931836 seconds
Starting the Capybara driver server...
Capybara starting Puma...
* Version 6.4.0, codename: The Eagle of Durango
* Min threads: 0, max threads: 4
* Listening on unix:///var/folders/03/cb7xhp2d7rl2mxq4f1r6wh140000gn/T/20240719-28919-4uztey

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