Upgrade to CodeQL Action v2

[jibeee]

CodeQL Action v1 will be deprecated on December 7th, 2022. This PR upgrades to v2.

See https://github.blog/changelog/2022-04-27-code-scanning-deprecation-of-codeql-action-v1/

[codecov-commenter]

Codecov Report

Merging #29 (2288b5b) into master (01c6639) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   70.47%   70.47%           
=======================================
  Files           5        5           
  Lines         254      254           
=======================================
  Hits          179      179           
  Misses         75       75           

---

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 01c6639...2288b5b. Read the comment docs.