Improve CI

[solnic]

• Exlude rubocop from CI's bundle - this was needed because we want to test things when rack is not installed too and unfortunately rubocop-rails depends on rack, so rack was always installed
• Measure coverage on latest Ruby 3.3 - we're gonna have specs that run only under 3.3 once Vernier branch is merged and w/o this tweak coverage would go down
• Add rack 3.1 and redis 5.3 to the test matrix

skip-changelog

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.67%. Comparing base (9d23b6f) to head (7753850). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2388 +/- ## ========================================== - Coverage 98.69% 98.67% -0.02% ========================================== Files 210 210 Lines 13910 13910 ========================================== - Hits 13728 13726 -2 - Misses 182 184 +2 ``` | [Components](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | Coverage Δ | | |---|---|---| | [sentry-ruby](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `99.05% <100.00%> (-0.02%)` | :arrow_down: | | [sentry-rails](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `97.34% <ø> (ø)` | | | [sentry-sidekiq](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `97.01% <ø> (ø)` | | | [sentry-resque](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `96.79% <ø> (ø)` | | | [sentry-delayed_job](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `98.92% <ø> (ø)` | | | [sentry-opentelemetry](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `100.00% <ø> (ø)` | | | [Files](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | Coverage Δ | | |---|---|---| | [...y-ruby/spec/sentry/rack/capture\_exceptions\_spec.rb](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388?src=pr&el=tree&filepath=sentry-ruby%2Fspec%2Fsentry%2Frack%2Fcapture_exceptions_spec.rb&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry#diff-c2VudHJ5LXJ1Ynkvc3BlYy9zZW50cnkvcmFjay9jYXB0dXJlX2V4Y2VwdGlvbnNfc3BlYy5yYg==) | `100.00% <100.00%> (ø)` | | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2388/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry)

[solnic]

The diff in cov against master is most likely caused by the fact that this PR runs coverage under 3.3 and master 3.2, so we can just ignore it