Refactor FXIOS-13464 [Swift 6 migration] Turn on strict concurrency for the RustMozillaAppServices target

[ih-codes]

📜 Tickets

Jira ticket
Github issue

💡 Description

• Turn on strict concurrency for the RustMozillaAppServices target.

I didn't see any warnings, so let's see what Bitrise says...

I'm wondering if changing this setting for RustMozillaAppServices actually works like I think though, with how the framework is set up? 🤔

cc @Cramsden @lmarceau @dataports | Swift 6 Migration

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If needed, I updated documentation and added comments to complex code
• If needed, I added a backport comment (example @Mergifyio backport release/v150.0)

[mobiletest-ci-bot]

	Messages
📖	Edited 1 files
📖	Created 0 files

Generated by 🚫 Danger Swift against 6ec4691