v0.106.3

Oceananigans v0.106.3

Diff since v0.106.2

Merged pull requests:

• Partial cell conservation (#5356) (@simone-silvestri)
• Add flow over hill validation using open boundaries and a hydrostatic model with implicit surface (#5359) (@tomchor)
• Remove initialization_update_state! and clean up initialization (#5420) (@glwagner)
• Fix typo in Simulation tips docs (#5425) (@glwagner)
• Relieve memory in unit tests (#5428) (@simone-silvestri)
• Fix formatting and citation errors in index.md (#5430) (@navidcy)
• Bump minor version from 0.106.2 to 0.106.3 (#5431) (@simone-silvestri)