chore: Update kevinrob/guzzle-cache-middleware requirement from ^7.0 to ^8.0

[dependabot]

Updates the requirements on kevinrob/guzzle-cache-middleware to permit the latest version.

Commits

• 9c05662 Add support for Guzzle 8 (#220)
• 78dd5a1 Fix Age header value type to string for PSR compliance (#218)
• 5d4df72 Fix #82: Fully honor Guzzle 'sink' option on cache hits and revalidations (#217)
• c2f752a Fix #172: Invalidate corrupted cache entries across all storage adapters (#216)
• daffa41 Fix DST caching bug by using strict timestamp arithmetic and add regression t...
• 69cdadd Upgrade dependencies to support Laravel 13 and Symfony 8, and cleanup compose...
• ce4e86b Implement PSR-20 Clock for deterministic time management and faster tests (#213)
• de928f3 Modernize PHP support: drop PHP < 8.2 and add PHP 8.5 (#212)
• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

---

Note

Overview
Bumps kevinrob/guzzle-cache-middleware from ^7.0 to ^8.0 in composer.json, aligning with the middleware’s newer major release (Guzzle 8 support, PSR fixes, and related cache behavior changes).

Because v8 drops support for PHP below 8.2, the PR also raises the minimum PHP version to 8.2 in GitHub Actions (php-version) and in the README requirement text so CI and documented setup match what Composer can install.

^{Reviewed by Cursor Bugbot for commit a99474d. Bugbot is set up for automated code reviews on this repo. Configure here.}

[devin-ai-integration]

This bump can't be merged as-is: kevinrob/guzzle-cache-middleware 8.0.0 dropped PHP < 8.2, while this example documents PHP 8.1 as its minimum and CI runs php-version: 8.1. Reproduced locally on PHP 8.1.34:

- Root composer.json requires kevinrob/guzzle-cache-middleware ^8.0 -> satisfiable by kevinrob/guzzle-cache-middleware[8.0.0].
- kevinrob/guzzle-cache-middleware 8.0.0 requires php >=8.2 -> your php version (8.1.34) does not satisfy that requirement.

Also note launchdarkly/server-sdk 6.8.2 suggests/tests this package at ^7 and itself supports php >=8.1, so widening here would get ahead of the SDK.

Recommended options: close this PR (@dependabot ignore this major version), or change it to ^7.0 || ^8.0 only if/when the example and CI move to PHP 8.2+.

Written by Devin