Update dependency @actions/cache to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@actions/cache (source)	^4.0.3 → ^6.0.0

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Release Notes

actions/toolkit (@​actions/cache)

v6.0.0

• Breaking change: Package is now ESM-only
  • CommonJS consumers must use dynamic import() instead of require()

v5.0.5

• Bump @actions/glob to 0.5.1

v5.0.4

• Bump @actions/http-client to 3.0.2

v5.0.3

Prevent retries for rate limited cache operations 2243.

v5.0.1

• Fix Node.js 24 punycode deprecation warning by updating @azure/storage-blob from ^12.13.0 to ^12.29.1 #​2213
• Newer storage-blob uses @azure/core-rest-pipeline instead of deprecated @azure/core-http, which eliminates the transitive dependency on node-fetch@2 → whatwg-url@5 → tr46@​0.0.3 that used the deprecated punycode module

v5.0.0

• Remove @azure/ms-rest-js dependency #​2197
  • The TransferProgressEvent type is now imported from @azure/core-rest-pipeline instead of @azure/ms-rest-js
• Bump @actions/core from ^1.11.1 to ^2.0.0 #​2198
• Bump @actions/exec from ^1.0.1 to ^2.0.0 #​2198
• Bump @actions/glob from ^0.1.0 to ^0.5.0 #​2198
• Bump @actions/http-client from ^2.1.1 to ^3.0.0 #​2198
• Bump @actions/io from ^1.0.1 to ^2.0.0 #​2198
• Add support for Node.js 24 #​2110
• Add node-fetch override to resolve audit vulnerabilities #​2110

v4.1.0

• Remove client side 10GiB cache size limit check & update twirp client #​2118

v4.0.5

• Reintroduce @​protobuf-ts/runtime-rpc as a runtime dependency #​2113

v4.0.4

⚠️ Faulty patch release. Upgrade to 4.0.5 instead.

• Optimized cache dependencies by moving @protobuf-ts/plugin to dev dependencies #​2106
• Improved cache service availability determination for different cache service versions (v1 and v2) #​2100
• Enhanced server error handling: 5xx HTTP errors are now logged as errors instead of warnings #​2099
• Fixed cache hit logging to properly distinguish between exact key matches and restore key matches #​2101

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