v3.7.1

UnicodePlots v3.7.1

Diff since v3.7.0

Merged pull requests:

• add dependabot action (#393) (@t-bltg)
• make FreeTypeExt thread-safe (#394) (@t-bltg)
• add codespell action (#395) (@t-bltg)
• do not warn, but error (#396) (@t-bltg)
• update docs (#397) (@t-bltg)
• fix precompilation (#399) (@t-bltg)