Updating to Cocoapods 1.13.0 fixed the issue for me and no need for this anymore:
https://stackoverflow.com/questions/77136958/flutter-xcode-15-error-xcode-dt-toolchain-dir-cannot-be-used-to-evaluate-libr
Inventrohyder
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This worked for me when everything else failed
https://stackoverflow.com/questions/77136958/flutter-xcode-15-error-xcode-dt-toolchain-dir-cannot-be-used-to-evaluate-libr