chore: remove p-limit types

[kjin]

p-limit@2.2.0 has its own types.

[DominicKramer]

LGTM once the tests pass. Thanks for addressing this.

[codecov]

Codecov Report

Merging #645 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #645   +/-   ##
=======================================
  Coverage   92.91%   92.91%           
=======================================
  Files          38       38           
  Lines        3556     3556           
  Branches      106      106           
=======================================
  Hits         3304     3304           
  Misses        229      229           
  Partials       23       23

Impacted Files	Coverage Δ
src/agent/io/sourcemapper.ts	85.71% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a316c6c...ef9e512. Read the comment docs.