build(deps): add fuzzer_runner dependency updates (#451)

Updates pyasn1 0.6.1 → 0.6.2 and urllib3 2.5.0 → 2.6.3 in fuzzer_runner.

These updates are from Dependabot PRs #448 and #449.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: hbrodin