fix(solana): support Transaction v1 when fetching transactions and blocks

[rickyrombo]

Why

Helius flagged that our getTransaction calls do not set maxSupportedTransactionVersion: 1. Transaction v1 activates on mainnet 2026-09-15 ~01:20 UTC (epoch 1035). After that, fetching a v1 transaction without the flag returns error -32015 and the indexer would stall retrying.

Every indexed transaction (including Geyser-subscribed ones) is re-fetched through FetchTransactionWithCache, which pinned the version to 0. Two backfiller getBlock calls and two CLI tools had the same pin.

There was also a hidden blocker: we pinned a personal fork of solana-go (based on v1.13.0) via replace. Its decoder treats every versioned prefix as v0, so setting the flag alone would have mis-parsed v1 bytes.

What

• Request maxSupportedTransactionVersion=1 in FetchTransactionWithCache, the backfiller's getBlock calls, geyser_transform and sol_refresher.
• Upgrade github.com/gagliardetto/solana-go to upstream v1.23.0, which decodes v1 messages (SIMD-0385), and drop the fork replace. All fork-only changes (ATL length encoding, ATA SysVarRent removal, signature padding, SetAccounts) are already upstream, except getProgramAccountsV2.
• Port the paginated getProgramAccountsV2 wrapper into cmd/reclaim_rent/gpa_v2.go, its only caller.
• Add transaction_version_test.go asserting the indexer requests version 1.

go mod tidy also bumps grpc v1.71.1 → v1.80.0 and several indirect deps.

Notes

• geyser_transform maps reward types with a fallthrough to Unspecified, so the new v1 reward type is safe. Nothing parses ComputeBudget priority fees, so the fee relocation does not affect indexing.
• This should deploy before Monday's activation.

Verification

• go build ./..., go vet, gofmt clean.
• New test plus existing TestFetchTransactionWithCache_* and TestResolveLookupTables pass.
• Upstream solana-go v1 decode tests pass against the pinned version.
• Remaining tests in the package need a live test database and were not run locally.

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