docs(readme): fix devnet matcher address (table was internally inconsistent)

[asastuai]

what

the "Program Addresses" table at line 446-453 lists devnet matcher as GTRgyTDfrMvBubALAqtHuQwT8tbGyXid7svXZKtWfC9k. that program has had no devnet transactions since 2026-03-30. the active devnet matcher is 4HcGCsyjAqnFua5ccuXyt8KRRQzKFbGTJkVChpS7Yfzy, which the same README already documents at line 747 ("Devnet Program Addresses" table).

same README, same field, two different values across two tables.

why

verified via getSignaturesForAddress against api.devnet.solana.com on 2026-05-05:

address	source line	latest tx	status
GTRgyTDfr...	line 453 (Program Addresses)	2026-03-30 12:04 UTC	dormant ~36 days
4HcGCsyj...	line 747 (Devnet Program Addresses)	2026-05-04 04:39 UTC	active

both are real, deployed, non-malicious programs (both owned by BPFLoaderUpgradeable). the 4HcGCsyj... address is canonical, it matches what dcccrypto/percolator-launch/README.md line 380 also documents.

a developer setting up an SDK integration against devnet using the table at the top of the README hits a dormant program.

changes

• README.md line 453: change GTRgyTDfrMvBubALAqtHuQwT8tbGyXid7svXZKtWfC9k to 4HcGCsyjAqnFua5ccuXyt8KRRQzKFbGTJkVChpS7Yfzy.
• no change to line 747; that table already had the correct value.

test plan

• no code changes
• 4HcGCsyj... resolves on devnet (verified via RPC)
• value now matches the second table at line 747 in this same README
• value matches percolator-launch/README.md line 380

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