Update Ditto SDK dependency to 4.8.3

[bplattenburg]

Updates the Ditto SDK minimum version to 4.8.3 to avoid the iOS 18 crash.

[bplattenburg]

Given this is a breaking change, I'm going to hold merging this until other outstanding work makes it in

[bplattenburg]

I've gone back and forth on 4.8.3 vs 4.9.1 here and could use some other thoughts. Both versions include the Ditto SDK crash fix for iOS 18, and the tradeoff is 4.8.3 lets a broader range of SDK users leverage tools, while 4.9.1 also includes a fix for a memory leak in the DiskUsage code underlying the DittoDiskUsage tool.

[rdas-ditto]

I propose we always build tools on the latest SDK (e.g., 4.9.1) to include the newest fixes and features. For users needing older versions, we can tag tools with SDK releases (e.g., v4.8.3-tools). This approach keeps us current while providing access to legacy-compatible tools and demo apps. Thoughts?

[bplattenburg]

I propose we always build tools on the latest SDK (e.g., 4.9.1) to include the newest fixes and features. For users needing older versions, we can tag tools with SDK releases (e.g., v4.8.3-tools). This approach keeps us current while providing access to legacy-compatible tools and demo apps. Thoughts?

We discussed this a bit earlier, but I wanted to capture it here as well.

Today, we try to keep the minimum version relatively low to allow flexibility for customers to use the latest tools with multiple SDK versions, and only update it when there is meaningful impact. Any SDK version update is also considered a SemVer major change because it could be breaking for a customer, so we try to minimize those when possible.