Update dependency proj4 to ^2.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
proj4 (source)	^2.14.0 -> ^2.15.0

---

Release Notes

proj4js/proj4js (proj4)

v2.15.0

Compare Source

What's Changed

• Support more datum codes with smaller library size by @​ahocevar in https://github.com/proj4js/proj4js/pull/486
• Start UTM zone defs at 32601 and 32701 instead of 32600 and 32700 by @​ahocevar in https://github.com/proj4js/proj4js/pull/487

Full Changelog: proj4js/proj4js@v2.14.0...v2.15.0

---

Configuration

📅 Schedule: Branch creation - "before 4am on the first day of the month" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.36%. Comparing base (714b87f) to head (d5ded5f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1130   +/-   ##
=======================================
  Coverage   89.36%   89.36%           
=======================================
  Files          58       58           
  Lines        3422     3422           
  Branches      455      455           
=======================================
  Hits         3058     3058           
  Misses        364      364