chore: bump aws-lc-rs 1.15.3 → 1.16.2 and aws-lc-sys 0.36.0 → 0.39.1

[nicklasl]

Summary

• Bump aws-lc-rs from 1.15.3 to 1.16.2 and aws-lc-sys from 0.36.0 to 0.39.1
• Lockfile-only change, no Cargo.toml modifications needed
• Only affects the native Rust provider (openfeature-provider/rust/)

Security

Resolves 5 high-severity Dependabot alerts on aws-lc-sys:

Alert	Severity	Advisory	Fixed in
#29	HIGH	GHSA-vw5v-4f2q-w9xf — PKCS7_verify Certificate Chain Validation Bypass	0.38.0
#30	HIGH	GHSA-65p9-r9h6-22vj — Timing Side-Channel in AES-CCM Tag Verification	0.38.0
#31	HIGH	GHSA-hfpc-8r3f-gw53 — PKCS7_verify Signature Validation Bypass	0.38.0
#39	HIGH	GHSA-394x-vwmw-crm3 — X.509 Name Constraints Bypass via Wildcard/Unicode CN	0.39.0
#40	HIGH	GHSA-9f94-5g5w-gf6r — CRL Distribution Point Scope Check Logic Error	0.39.0

Test plan

• CI passes

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