v1.38.3

Plots v1.38.3

Diff since v1.38.2

Closed issues:

• [BUG] can't plot with default colour scale with high precision floats (#4270)
• [BUG] Failed precompile Plots after update Julia to 1.8.4 (#4608)

Merged pull requests:

• Add :unitformat to _base_supported_args (#4639) (@xwjqv)
• switch to lowercase 'plotly' require.js dependency (#4640) (@marius311)
• fix spurious GR warning (#4641) (@t-bltg)
• simplify open (#4642) (@t-bltg)
• don't write nans into zlims (#4643) (@BeastyBlacksmith)