Bump Light Protocol crates to 0.23.0

[tilo-14]

Summary

• Bump all Light Protocol crates from 0.17.1–0.19.0 to 0.23.0 across all examples
• Fix breaking API changes: removed anchor-discriminator feature, PackedAddressTreeInfoExt trait import, light-token module restructuring
• Keep blake3 at =1.8.2 (1.8.3 requires edition2024, incompatible with SBF toolchain)
• Bump utility crates: tokio 1.49.0, serial_test 3.4.0, solana-pubkey 2.4

Scope

All examples except airdrop-implementations/distributor/ (separate effort).

Includes submodule update for nullifier-program.

Verification

• cargo build-sbf passes for all 14 projects

Test plan

• CI rust-tests pass
• CI typescript-tests pass

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[coderabbitai]

Important

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 5 additional findings.