v6.2.1

This is a bugfix release which resolves bundler issues due to a circular dependency, and brings a few documentation and example fixes.

List of all changes

• #10656 - Fix for export PDF example compatibility issues, and layer opacity handling. (@mike-000)
• #10653 - More reliable check for module content beyond classes (@ahocevar)
• #10617 - Improve apidoc generation performance (@MoonE)
• #10625 - Apidoc cleanup navigation html (@MoonE)
• #10649 - Remove circular dependency (@ahocevar)
• #10637 - Develop on 6.2.1 (@openlayers)