chore(deps): update google/oss-fuzz digest to c4b593c

[renovate-sh-app]

This PR contains the following updates:

Package	Type	Update	Change
google/oss-fuzz	action	digest	4bf20ff → c4b593c

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Note

Updates pinned commits for OSS-Fuzz CIFuzz GitHub Actions in the fuzzing workflow.

• Bumps google/oss-fuzz/infra/cifuzz/actions/build_fuzzers and .../run_fuzzers to a newer digest in .github/workflows/fuzzing.yml
• No workflow logic changes; inputs and steps remain the same

^{Written by Cursor Bugbot for commit 2b393fc. This will update automatically on new commits. Configure here.}