Fix depwarn for cairomakie lines

[SimonDanisch]

CairoMakie was double converting the linestyle (@get_attribute already applies attribute_conversion), so it was running into the depwarn for any linestyle...

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(display(fig))

	using	create	display	create	display
GLMakie	11.92s (11.82, 12.04) 0.07+-	1.16s (1.13, 1.18) 0.02+-	706.54ms (689.12, 753.16) 21.23+-	10.82ms (10.68, 10.98) 0.11+-	137.62ms (136.93, 138.91) 0.69+-
master	11.94s (11.88, 12.11) 0.08+-	1.17s (1.16, 1.18) 0.01+-	696.32ms (685.19, 706.58) 6.59+-	10.78ms (10.64, 11.02) 0.12+-	137.28ms (136.34, 138.21) 0.84+-
evaluation	-0.17%, -0.02s invariant (-0.27d, 0.63p, 0.08std)	-1.24%, -0.01s invariant (-1.08d, 0.08p, 0.01std)	+1.45%, 10.22ms invariant (0.65d, 0.26p, 13.91std)	+0.38%, 0.04ms invariant (0.36d, 0.51p, 0.11std)	+0.25%, 0.34ms invariant (0.45d, 0.42p, 0.76std)
CairoMakie	14.82s (12.76, 16.10) 1.05+-	1.54s (1.32, 1.79) 0.14+-	283.53ms (263.49, 311.36) 19.19+-	17.16ms (16.07, 18.07) 0.67+-	9.35ms (8.46, 9.85) 0.45+-
master	14.82s (12.76, 15.84) 1.13+-	1.61s (1.37, 1.83) 0.16+-	333.26ms (268.36, 473.71) 67.96+-	16.77ms (15.92, 18.15) 0.94+-	6.94ms (6.53, 8.04) 0.56+-
evaluation	+0.01%, 0.0s invariant (0.00d, 1.00p, 1.09std)	-4.47%, -0.07s invariant (-0.45d, 0.42p, 0.15std)	-17.54%, -49.73ms noisy🤷‍♀️ (-1.00d, 0.11p, 43.57std)	+2.28%, 0.39ms invariant (0.48d, 0.39p, 0.80std)	+25.82%, 2.42ms slower❌ (4.78d, 0.00p, 0.50std)
WGLMakie	17.22s (16.40, 18.39) 0.69+-	1.77s (1.69, 1.91) 0.09+-	15.87s (15.35, 16.78) 0.50+-	23.54ms (21.85, 25.12) 1.28+-	1.49s (1.36, 1.63) 0.08+-
master	17.54s (16.51, 19.05) 0.89+-	1.79s (1.69, 1.92) 0.08+-	16.21s (15.20, 17.52) 0.90+-	22.57ms (21.19, 23.52) 0.79+-	1.48s (1.34, 1.62) 0.08+-
evaluation	-1.88%, -0.32s invariant (-0.41d, 0.46p, 0.79std)	-1.53%, -0.03s invariant (-0.32d, 0.56p, 0.08std)	-2.17%, -0.34s invariant (-0.47d, 0.40p, 0.70std)	+4.14%, 0.97ms invariant (0.91d, 0.12p, 1.04std)	+0.82%, 0.01s invariant (0.15d, 0.79p, 0.08std)