[Help Wanted]: Syntax Error during CopilotForXcode Local Build

### Before Reporting

- [X] I have checked FAQ, and there is no solution to my issue
- [X] I have searched the existing issues, and there is no existing issue for my issue

### Describe your issue

Hello,
I attempted to build CopilotForXcode locally, but received the following error:
```
Call to method 'rebuildService' in closure requires explicit use of 'self' to make capture semantics explicit
```

My development environment is:
```
admin@Mac-mini ~ % xcodebuild -version
Xcode 14.1
Build version 14B47b

admin@Mac-mini ~ % swift --version
swift-driver version: 1.62.15 Apple Swift version 5.7.1 (swiftlang-5.7.1.135.3 clang-1400.0.29.51)
Target: arm64-apple-macosx12.0
```
The code version I am trying to build is tag 0.18.0.

Could you please provide any guidance on how to address this error?

Thank you in advance for your help.

Best regards,

Check out tag 0.18.0 and reproduce the local build with Xcode 14.1 and Swift 5.7.1. Start from the compiler diagnostic for rebuildService and inspect the surrounding closure to identify the required change. Done means the project builds successfully in the reported environment.

索引モデルが issue の本文から書いたものです。