Update Rack to 3.0.9.1 to Address Warnings

[charleyf]

🛠 Summary of changes

Currently in main (and all my PRs) running make lint fails with the warnings below.

Running bundle update rack updates rack and fixes this issue. I haven't done any testing beyond that.

--- bundler-audit ---
bundle exec bundler-audit check --update
Updating ruby-advisory-db ...
From https://github.com/rubysec/ruby-advisory-db
 * branch            master     -> FETCH_HEAD
Already up to date.
Updated ruby-advisory-db
ruby-advisory-db:
  advisories:   874 advisories
  last updated: 2024-02-24 17:04:04 -0800
  commit:       5d80bde618c0836393581d7c8eb9ca61600a255f
Name: rack
Version: 3.0.8
CVE: CVE-2024-25126
Criticality: Unknown
URL: https://discuss.rubyonrails.org/t/denial-of-service-vulnerability-in-rack-content-type-parsing/84941
Title: Denial of Service Vulnerability in Rack Content-Type Parsing
Solution: upgrade to '~> 2.2.8, >= 2.2.8.1', '>= 3.0.9.1'

Name: rack
Version: 3.0.8
CVE: CVE-2024-26141
Criticality: Unknown
URL: https://discuss.rubyonrails.org/t/possible-dos-vulnerability-with-range-header-in-rack/84944
Title: Possible DoS Vulnerability with Range Header in Rack
Solution: upgrade to '~> 2.2.8, >= 2.2.8.1', '>= 3.0.9.1'

Name: rack
Version: 3.0.8
CVE: CVE-2024-26146
Criticality: Unknown
URL: https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
Title: Possible Denial of Service Vulnerability in Rack Header Parsing
Solution: upgrade to '~> 2.0.9, >= 2.0.9.4', '~> 2.1.4, >= 2.1.4.4', '~> 2.2.8, >= 2.2.8.1', '>= 3.0.9.1'

Vulnerabilities found!
make: *** [lint] Error 1

[zachmargolis]

I think this is a dupe of #10159