Plugins/SwiftProtobufPlugin/plugin.swift generating deprecation warnings with Xcode 26

[thomasvl]

Looks like as of Xcode 26 the source is generating about three dozen warnings for various things. Haven't looked to see if things will need to be version gated or not, that's likely the first step to updating things.

[thomasvl]

@FranzBusch @gjcairo fyi.

[AryanBagade]

hey @thomasvl @gjcairo
if this issue is open for external contributors, can i work on it
i have contributed to multiple projects like facebook/pyrefly , kubernetes/autoscaler , vercel/turborepo , nvidia/dynamo now wanna gets my hands into this stuff
if its for external contributors could you please assign it to me!

[thomasvl]

Yup, anyone can put up a PR for it.

[AryanBagade]

could you please assign me this issue!