v2.18.6

What's Changed

• Bump actions/setup-python from 5.4.0 to 5.5.0 in the actions group by @dependabot in #2940
• Bump pytest-cov from 6.0.0 to 6.1.1 in the requirements group by @dependabot in #2960
• Pin numcodecs to < 0.16 to fix v2 by @dstansby in #2965
• Add a changelog for 2.18.6 by @dstansby in #2970

Full Changelog: v2.18.5...v2.18.6