[Snyk] Security upgrade propshaft from 0.7.0 to 0.8.0

[JJediny]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile
  • Gemfile.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	616/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.9	Web Cache Poisoning SNYK-RUBY-RACK-1061917	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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[aduth]

I'm just going to leave this open, since I think that'll stop Snyk from opening new pull requests.

Same as #9437, #9386, #9323, #9261, #9185, #9204, #7193.

This is being handled in #9359.

[aduth]

rack dependency upgrade handled in #9359