Add a return type to captureUtils (#1704)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

packages/cursorless-engine/src/processTargets/modifiers/scopeHandlers/TreeSitterScopeHandler/captureUtils.ts

@@ -1,3 +1,4 @@
+import { Range } from "@cursorless/common";
 import { QueryMatch } from "../../../../languages/TreeSitterQuery/QueryCapture";
 
 /**
@@ -51,7 +52,7 @@ export function getRelatedRange(
   scopeTypeType: string,
   relationship: string,
   matchHasScopeType: boolean,
-) {
+): Range | undefined {
   return getRelatedCapture(
     match,
     scopeTypeType,