Update actions/cache action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/cache	action	major	v5 → v6

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Release Notes

actions/cache (actions/cache)

v6.1.0

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What's Changed

• Bump @​actions/cache to v6.1.0 - handle read-only cache access by @​jasongin in #​1768

Full Changelog: actions/cache@v6...v6.1.0

v6.0.0

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What's Changed

• Update packages, migrate to ESM by @​Samirat in #​1760

Full Changelog: actions/cache@v5...v6.0.0

v6

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DeepSource Code Review

We reviewed changes in b577921...837669e on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

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Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
C & C++		Jun 23, 2026 3:43p.m.	Review ↗
Docker		Jun 23, 2026 3:43p.m.	Review ↗
Python		Jun 23, 2026 3:43p.m.	Review ↗
Secrets		Jun 23, 2026 3:43p.m.	Review ↗

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