chore: Upgrade grpc-swift to 1.26.1 and swift-protobuf to 1.30.0

[dongjoon-hyun]

What's Changed

This PR aims to update the dependencies up-to-date to bring the new features and bug fixes. This is also the foundation to update to the next versions.

• swift-protobuf from 1.29.0 to 1.30.0.

  • https://github.com/apple/swift-protobuf/releases/tag/1.30.0
    • Drop Swift 5.9 apple/swift-protobuf#1775
    • Swift 6.1 on CI apple/swift-protobuf#1768

• grpc-swift from 1.25.0 to 1.26.1.

  • https://github.com/grpc/grpc-swift/releases/tag/1.26.1
  • https://github.com/grpc/grpc-swift/releases/tag/1.26.0
    • Drop Swift 5.9 grpc/grpc-swift#2231

Closes #57 .

[dongjoon-hyun]

Since I'm not sure about the official PR title rule (other than feat: and chores:), I used GH-57 like Apache Arrow main repository. Please let me know if there is a rule which I can follow, @kou .

[kou]

We are using Conventional Commits:

https://github.com/apache/arrow-swift/blob/main/CONTRIBUTING.md

So we should use chore: in this case.

BTW, I want to automate this by Dependabot...:

arrow-swift/.github/dependabot.yml

Lines 27 to 33 in 672a48c

	- package-ecosystem: "swift"
	directory: "/"
	schedule:
	interval: "weekly"
	commit-message:
	prefix: "chore: "
	open-pull-requests-limit: 10

[kou]

https://github.com/apache/arrow-swift/actions/runs/15820798896/job/44589372934#step:3:268

updater | 2025/06/23 09:42:56 ERROR <job_1038919954> Illformed requirement [">= .upToNextMajor(from: \"1.2.0\") // or `.upToNextMinor"]

Hmm. It seems that we can't use upToNextMajor(from: "1.2.0") with Dependabot...

[dongjoon-hyun]

Thanks. Since it's going to be automated, let me close this.

[dongjoon-hyun]

I feel that I don't add any values to Apache Arrow repo and community.

I'll be away from this repo and try to revisit when it's finished.

I'm looking forward to seeing the success of this package as an audience of Swift Package Index.

Thank you for delivering this. Cheers!