Move to newer keyring fork (fixes iOS builds)

[gBasil]

This moves from https://github.com/99designs/keyring to a maintained fork of it, https://github.com/ByteNess/keyring. I contributed support for iOS builds to it, and this PR makes ipatool buildable for iOS.

Resolves #136.

Note that:

1. The GitHub Actions workflows need updating, which I haven't done, because I'm not sure what resources are available on the macOS runners.
   • In addition to building it, you need to give it the right entitlements to run it on a jailbroken device.
2. The Go version in go.mod was bumped. I'm not sure if you want it to stay at 1.23.0.
3. I've been only able to get it build for newer iOS versions (specifically 15.0+, for reasons I've outlined here), but I'm reasonably certain that you could get it to work for older versions.

[Copilot]

Pull request overview

This PR migrates ipatool’s keyring dependency from 99designs/keyring to the maintained byteness/keyring fork to enable iOS builds (resolving #136).

Changes:

• Replaced github.com/99designs/keyring imports with github.com/byteness/keyring across command and keychain packages/tests.
• Updated module dependencies to github.com/byteness/keyring v1.9.0 and refreshed go.sum.
• Bumped the go.mod Go version directive to go 1.25.0 (and removed the toolchain directive).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pkg/keychain/keyring.go	Updates keyring import to the new fork for the keyring interface types.
pkg/keychain/keychain_set.go	Updates keyring import used by Set implementation.
pkg/keychain/keychain_set_test.go	Updates keyring import used in mocks/tests.
pkg/keychain/keychain_get_test.go	Updates keyring import used in mocks/tests.
cmd/common.go	Updates keyring import for runtime keyring initialization.
go.mod	Swaps keyring dependency, bumps Go version, and brings in new indirect deps.
go.sum	Updates checksums for the new dependency graph.

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[Copilot]

The module now declares go 1.25.0, but the repo’s GitHub Actions workflows are pinned to Go 1.23.0. With this change, CI/builds using Go 1.23 will fail with a “go.mod requires go >= 1.25.0” error; either bump the workflows/tooling to 1.25 (or higher) or keep the go directive at the supported version.

Suggested change

	go 1.25.0
	go 1.23.0

[Copilot]

The toolchain go1.23.2 directive was removed. If the project relies on the toolchain directive to keep local builds/CI reproducible (or to avoid developers using an older Go), consider keeping it (updated to the intended version) or documenting the expected Go toolchain version elsewhere.

Suggested change

	go 1.25.0
	go 1.25.0
	toolchain go1.25.0

[majd]

Thanks, @gBasil! Let's address the Go version bump and retain the current version to ensure the current workflows do not break.