GeoMakie v0.7.13

Diff since v0.7.12

Merged pull requests:

• don't omit all digits when printing ticks (#308) (@simeonschaub)
• Restore old doc theme (#320) (@asinghvi17)
• Bump patch version (#323) (@asinghvi17)
• Update make.jl (#326) (@asinghvi17)

Closed issues:

• Sub-degree tick labels (#322)
• Heatmap in GeoAxis not rendering properly in WGLMakie (#325)