The Swift 5 language mode ought to be a resting place

[groue]

Description

I can not upgrade RxGRDB (swift-tools-version: 5.7), that depends on RxSwift (swift-tools-version: 5.5) to GRDB 7 (swift-tools-version: 6.0) without compiler warnings: RxSwiftCommunity/RxGRDB#72

This makes no sense, because RxGRDB and RxSwift declare that they don't know anything about Swift 6.

Those undesired warnings are unacceptable.

To repeat the title of this issue: The Swift 5 language mode ought to be a resting place.

Reproduction

Build RxGRDB at RxSwiftCommunity/RxGRDB@04ea590

Expected behavior

No warning.

Environment

swift-driver version: 1.115.1 Apple Swift version 6.0.3 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)
Target: arm64-apple-macosx14.0

Additional information

Quoting https://hachyderm.io/@groue/113924602704476111 (colorful language amended):

I did not upgrade GRDB to Swift 6 and spent MONTHS sweating my concurrency annotations to be rewarded with such a stupid punishment. RxGRDB should be able to stay at Swift 5 without a single warning.