Updated swift-tools-support-core version from 0.2.3 to 0.2.7

[fummicc1]

Changes

I updated package swift-tools-support-core from 0.2.3 to 0.2.7 because I can't build mockolo with Xcode 14 beta 5 with swift-tools-support-core 0.2.3.

The origin of compiling error is here and I attached the error.

This issue is fixed in https://github.com/apple/swift-tools-support-core/pull/345 . which is included in version 0.2.7. That's why I updated swift-tools-support-core version in mockolo from 0.2.3 to 0.2.7.

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This issue was clarified thanks to @sidepelican and @omochi :pray:

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