Investigate remove actix_rt?

[ryardley]

          _:hammer_and_wrench: Refactor suggestion_

Update the actix_rt::main attribute to actix::main.

The actix_rt crate is deprecated in favor of the actix crate. Updating to actix::main ensures future compatibility and reduces deprecation warnings.

Apply this diff:

-#[actix_rt::main]
+#[actix::main]

Committable suggestion was skipped due to low confidence.

Originally posted by @coderabbitai[bot] in #156 (comment)