Bump main to 7.0.0~pre1

[chapulina]

Part of gazebo-tooling/release-tools#459

[codecov]

Codecov Report

Merging #164 (a5ad215) into main (1d92937) will not change coverage.
The diff coverage is n/a.

❗ Current head a5ad215 differs from pull request most recent head 825b31f. Consider uploading reports for the commit 825b31f to get more accurate results

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   75.90%   75.90%           
=======================================
  Files          27       27           
  Lines        2747     2747           
=======================================
  Hits         2085     2085           
  Misses        662      662           

---

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 1d92937...825b31f. Read the comment docs.