Bump spirit to @main (16c62ef306a1)

[morgo]

Bumps github.com/block/spirit to the current main (16c62ef306a1), and
github.com/block/mysql to ee0a93fe50d6 to match what spirit now requires.

Supersedes #25, which was opened at spirit 1ab2595e45a1 and predates
main's move to the block/mysql driver (#24). This branch is built fresh on
current upstream/main, so #25 can be closed.

Range since polt's previous pin (dc3d4c9f4c3b..16c62ef306a1)

• 10804bbe247c — dbconn: take RDS TLS from the driver, and drop rejectReadOnly (#1221)
• a31c0ecc9544 — Enable depguard to keep exactly one MySQL driver linked (#1222)
• 2d48942b5f91 — feat(move): add host-aware autoscaling for sharded moves (#1216)
• 1ab2595e45a1 — fix(statement): fold TRUE/FALSE keyword defaults on integer columns (#1224)
• 16c62ef306a1 — fix(dbconn): read tinyint(1) as an integer, not a bool (#1226)

Checked for downstream impact, none found:

• rejectReadOnly removal (#1221) — grepped for RejectReadOnly: zero hits.
• The depguard lint (#1222) is spirit-internal; it does not constrain consumers.
• tinyint(1) (#1226) is applied inside newDSN, so it reaches connections
  opened through dbconn.New. A consumer calling dbconn.EnhanceDSNWithTLS
  and opening the DSN itself does not inherit it — polt has no
  EnhanceDSNWithTLS call sites.
• #1216 touches pkg/move/pkg/copier/pkg/host/pkg/applier without
  changing the APIs polt uses (table.NewChunker, the change interfaces).

Verification

• go.mod / go.sum only — zero source changes.
• ./bin/go build ./... clean.
• ./bin/go vet ./... clean (type-checks test files too).
• No replace line added, removed or changed; spirit main itself has none.
• Hermit toolchain is already go 1.26.6, matching spirit's go directive — no
  hermit rebuild in this PR.

🤖 Generated with Claude Code

[Copilot]

🔵 Needs a closer look

Moving dependency pins warrant final human review despite clean verification.

Pull request overview

Updates Spirit and the matching Block MySQL dependency to newer commits without source changes.

Changes:

• Bumps dependency pins.
• Refreshes module checksums.

File summaries

File	Description
go.sum	Updates dependency checksums.
go.mod	Updates dependency pins.

Review details

• Files reviewed: 1/2 changed files
• Comments generated: 0
• Review effort level: Lite

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