v2.12.0

Added

• Add griddash axis property to cartesian, polar, smith, ternary and geo subplots and add griddash and minorgriddash to carpet trace [6144], with thanks to @njwhite for the contribution!
• Implement various options to position and style minor ticks and grid lines on cartesian axis types including
  minor.tickmode, minor.tickvals, minor.tickcolor, minor.ticklen, minor.tickwidth, minor.dtick, minor.tick0, minor.nticks, minor.ticks,
  minor.showgrid, minor.gridcolor, minor.griddash and minor.gridwidth [6166]

Changed

• Use the "willReadFrequently" 2d context creation attribute to optimize readback performance [#6084],
  with thanks to @junov for the contribution!

Fixed

• avoid drawing blank tick labels on cartesian axes [#6163]