chore: increase heap memory when self-fuzzing

[oetr]

• fuzzing runs for different OS/Java versions should not cancel each other
• increase heap size when self-fuzzing

[Copilot]

Pull request overview

This PR improves the fuzzing workflow configuration by preventing matrix job cancellations and increasing heap memory for the ArgumentsMutatorFuzzTest. The changes ensure that fuzzing runs across different OS and Java version combinations can complete independently, and provide adequate memory for the intensive fuzzing workload that runs 1 million iterations in the GitHub Actions workflow.

Changes:

• Add fail-fast: false to fuzzing workflow strategy to allow all matrix combinations to complete independently
• Increase heap memory from 2GB to 4GB for ArgumentsMutatorFuzzTest to support intensive fuzzing workload

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/fuzzing.yml	Add fail-fast: false to strategy to prevent matrix jobs from canceling each other
selffuzz/src/test/java/com/code_intelligence/selffuzz/mutation/BUILD.bazel	Increase _JAVA_OPTIONS heap size from 2048m to 4096m for ArgumentsMutatorFuzzTest

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