build(deps): bump actions/cache from 5 to 6 #482

Job	Run time
Start gate (abort window)	2s
Code style (spotless) + package graph	1m 25s
Build WebUI assets (shared)	1m 23s
C++ Tests Ubuntu Latest x86_64	6m 0s
Test (vmlens interleavings)	1m 18s
Build and Test macOS 15 arm64 (no Metal)	31m 9s
Cross-Compile manylinux_2_28 x86_64 (CUDA)	21m 59s
Cross-Compile Android aarch64 (OpenCL/Adreno)	5m 6s
Cross-Compile Android aarch64	4m 23s
Cross-Compile manylinux2014 x86_64	5m 11s
Build and Test Linux aarch64	5m 4s
Build and Test Windows 2025 x86 (Ninja Multi-Config + sccache, eval)	8m 14s
Build and Test macOS 15 arm64 (Metal)	31m 9s
Build and Test macOS 14 arm64 (Metal)	4m 28s
Build and Test Windows 2025 x86 (VS 2026)	8m 2s
Build and Test Windows 2025 x86_64 (Ninja Multi-Config + sccache, eval)	5m 24s
Build and Test Windows 2025 x86_64 (VS 2026)	4m 21s
Java Tests macOS 14 arm64 (Metal)	5m 19s
Java Tests Ubuntu Latest x86_64	4m 23s
Java Tests macOS 15 arm64 (no Metal)	1s
Java Tests macOS 15 arm64 (Metal)	1s
Java Tests Windows 2025 x86_64 (Ninja, eval)	1s
Java Tests Windows 2025 x86_64 (VS 2026)	1s
Package JARs	1s
Report	1s
Check: main branch / SNAPSHOT	1s
Check: v* tag	1s
Publish Snapshot to Central	1s
Publish Release to Central	1s
Attach Signed Binaries to GitHub Release	1s
Update Snapshot Pre-release on GitHub	1s
	2h 34m 32s

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