[BUG] Plotly colorbar size does not scale with plot size

[stevenaleung]

Details

By default, the plotly colorbar is slightly offset in the y direction:

using Plots
data = rand(3, 3);
heatmap(data)

Increasing the tick font size shows that the colorbar also doesn't scale with plot size:

heatmap(data, colorbar=:right, tickfont=30, xlabel="test")

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)			x
pyplot			x
plotlyjs	x
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: 1.36.4
Backend version (]st -m <backend(s)>):

Output of versioninfo():
Julia Version 1.8.2
Commit 36034abf26 (2022-09-29 15:21 UTC)
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: 4 × Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-13.0.1 (ORCJIT, ivybridge)
Threads: 1 on 4 virtual cores

[t-bltg]

Xref #1180

[stevenaleung]

The main issue is the static colorbar size rather than the colorbar font - updating the title to reflect this