fix(deps): update aws-lc-sys to 0.38.0 to resolve security advisories (#77)

Update aws-lc-rs 1.15.4 -> 1.16.1 (aws-lc-sys 0.37.1 -> 0.38.0)
to fix three high-severity vulnerabilities:
- GHSA-hfpc-8r3f-gw53: PKCS7_verify Signature Validation Bypass
- GHSA-65p9-r9h6-22vj: Timing Side-Channel in AES-CCM Tag Verification
- GHSA-vw5v-4f2q-w9xf: PKCS7_verify Certificate Chain Validation Bypass

Author: bug-ops