Bump main to 5.0.0~pre1

[chapulina]

Branch ign-physics4 has been created for the Edifice release and 4.0.0 released from that.

The main branch now corresponds to version 5.0.0~pre1, and nightlies will soon be created from this branch.

gazebo-tooling/release-tools#421

[codecov]

Codecov Report

Merging #245 (c15c220) into main (b5e0511) will not change coverage.
The diff coverage is n/a.

❗ Current head c15c220 differs from pull request most recent head 09584f8. Consider uploading reports for the commit 09584f8 to get more accurate results

@@           Coverage Diff           @@
##             main     #245   +/-   ##
=======================================
  Coverage   82.39%   82.39%           
=======================================
  Files         109      109           
  Lines        4522     4522           
=======================================
  Hits         3726     3726           
  Misses        796      796           

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[chapulina]

All 🟢 !