Repo File Sync: Bump actions/cache from 5 to 6

[mu-automation]

synced local file(s) with microsoft/mu_devops.

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---

This PR was created automatically by the repo-file-sync-action workflow run #28162500804

[mu-automation]

✅ QEMU Validation Passed

Source Dependencies

Repository	Commit
mu_plus	d7556b3
mu_tiano_platforms	7c3c4bb

Results

Platform	Target	Build	Boot	Overall Boot Time	Build Logs	Boot Logs
Q35	DEBUG	✅ success	✅ success	0m 21s	Build Logs	Boot Logs
ArmVirt	DEBUG	✅ success	✅ success	0m 15s	Build Logs	Boot Logs

Workflow run: https://github.com/microsoft/mu_plus/actions/runs/28186803395

This comment was automatically generated by the Mu QEMU PR Validation workflow.

[mu-automation]

⚠️ Please add a meaningful PR title (update the default file sync title).

[makubacki]

I'm deprecating some Rust code in the repo. Unless this PR is very high priority (which I assume it is not), please just leave it open and we can rerun CI checks when that work is done.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/202511@32f552c). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             release/202511     #904   +/-   ##
=================================================
  Coverage                  ?   10.21%           
=================================================
  Files                     ?      150           
  Lines                     ?    24568           
  Branches                  ?     2346           
=================================================
  Hits                      ?     2509           
  Misses                    ?    22023           
  Partials                  ?       36           

Flag	Coverage Δ
AdvLoggerPkg	3.03% <ø> (?)
HidPkg	2.79% <ø> (?)
MfciPkg	34.00% <ø> (?)
MsCorePkg	1.30% <ø> (?)
MsWheaPkg	7.37% <ø> (?)
XmlSupportPkg	25.46% <ø> (?)

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