Repo: Build failure on main: explicit-function-return-type in createProjectService.ts

[JoshuaKGoldberg]

Suggestion

Example from https://cloud.nx.app/runs/Bmb57hhYDR?utm_source=pull-request&utm_medium=comment:

/home/runner/work/typescript-eslint/typescript-eslint/packages/typescript-estree/src/create-program/createProjectService.ts
  51:7  error  Missing return type on function  @typescript-eslint/explicit-function-return-type
  52:7  error  Missing return type on function  @typescript-eslint/explicit-function-return-type
  54:7  error  Missing return type on function  @typescript-eslint/explicit-function-return-type

Was there some merge oddity from #8809?

[JoshuaKGoldberg]

cc @auvred @kirkwaiblinger @yeonjuan - #8809 had a passing build on merge, but looks like there's something borked here. Do any of you have time to look into this? 🙏

[auvred]

It looks like typescript-estree lint results were taken from the cache: https://cloud.nx.app/runs/LO236EMoxL/task/typescript-estree%3Alint (Perhaps it was the wrong cache?)

Here is the fix: #8966