Pin solana_parser deps to real immutable rev instead of branch reference

[Copilot]

Both solana_parser dependencies (main and dev) were pointing at a mutable branch reference, making builds non-reproducible. A previous attempt to fix this used a hallucinated commit SHA.

Changes

• Cargo.toml: Replace branch = "solana-parser-add-arbitrary" with the actual HEAD SHA of that branch, fetched via git ls-remote:

# Before
solana_parser = { git = "https://github.com/anchorageoss/solana-parser.git", branch = "solana-parser-add-arbitrary" }

# After
solana_parser = { git = "https://github.com/anchorageoss/solana-parser.git", rev = "a0c554d7a4d756cbe6c9bed080737faa9aa74705" }

Same rev applied to the [dev-dependencies] entry (with features = ["proptest"] preserved).

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