Add upcoming feature flag to SE-0412 to match inclusion in compiler #2382
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An upcoming feature flag is included for SE-0412 in the definition of upcoming features in the compiler.
The proposal itself notes the possibly of source incompatibilities that should be rare in practice:
https://github.com/apple/swift-evolution/blob/main/proposals/0412-strict-concurrency-for-global-variables.md#source-compatibility
This PR adds the upcoming feature flag to the proposal header.
The header also includes the new 'Enabled in Swift 6 language mode' annotation to indicating when the feature will be enabled.
// cc-ing authors and review manager to ensure this change is correct
@jckarter @sophiapoirier @hborla