Fix issue 26213: cache_filter_integration_test is flakey. #26357
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Commit Message: Fix issue 26081: cache_filter_integration_test is flakey.
Additional Description: Test-only change
Risk Level: None
Testing: bazel test //test/extensions/filters/http/cache:cache_filter_integration_test --test_output=errors --runs_per_test=10000 --test_filter=Protocols/CacheIntegrationTest.ServeGetFromUpstreamAfterHeadRequest/*
Fixes #26081