Update actions/cache action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
actions/cache	action	major	v5 → v6	v6.1.0

---

Release Notes

actions/cache (actions/cache)

v6.0.0

Compare Source

What's Changed

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

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

v6

Compare Source

---

Configuration

📅 Schedule: (in timezone Europe/Brussels)

• Branch creation
  • "before 7am every weekday"
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

Branch automerge failure

This PR was configured for branch automerge. However, this is not possible, so it has been raised as a PR instead.

---

• Branch has one or more failed status checks

[coveralls]

Coverage Report for CI Build 28149945694

Coverage remained the same at 100.0%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	1523
Covered Lines:	1523
Line Coverage:	100.0%
Relevant Branches:	1258
Covered Branches:	1258
Branch Coverage:	100.0%
Branches in Coverage %:	Yes
Coverage Strength:	1070.13 hits per line

---

💛 - Coveralls