chore: Upgrade github.com/ipfs/go-ds-pebble to v0.5.1 for Go 1.25 support

[stefanb]

Go 1.25 incompatibility detected in

• go 1.25rc2, [email protected] 1.24.5 (new formula) Homebrew/homebrew-core#226636

then:

• reported upstream in Enable Go 1.25 support cockroachdb/swiss#48
• fixed upstream Enable support for Go 1.25 cockroachdb/swiss#49

This PR brings just this upstream fix upstream to ipget by bubbling up through

• upgrade to pebble v2.0.6 go-ds-pebble#54 included in https://github.com/ipfs/go-ds-pebble/releases/tag/v0.5.1

Details:

Before:

go1.25rc1 build ./...
github.com/cockroachdb/swiss
# github.com/cockroachdb/swiss
github.com/cockroachdb/swiss
# github.com/cockroachdb/swiss
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/map.go:286:7: undefined: hashFn
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/map.go:337:14: undefined: getRuntimeHasher
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/map.go:338:22: undefined: fastrand64
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/map.go:600:23: undefined: fastrand64
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/map.go:649:19: undefined: fastrand64
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/map.go:670:20: undefined: fastrand64
../../../go/pkg/mod/github.com/cockroachdb/[email protected]/options.go:30:14: undefined: hashFn

After:

go1.25rc1 build ./...

(build successful)

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[gammazero]

Please update to use go-ds-pebble v0.5.1 or wait until kubo v0.36.0 is released and then depend on that.

[stefanb]

After merging please don't forget to make a release before or right after go 1.25 is released in August (rc2 is expected on tuesday, July 8th).

[gammazero]

I would prefer to wait until the next kubo release to create a new release of ipget. That should be very soon.

[lidel]

Triage note:

• Kubo 0.36.0-rc2 will ship later this week, final one expected to land next week