Fix rich rticks for PolarAxis (#3615)

* Widen type of rticklabel of PolarAxis from AbstractString to Any

* Emend test to include rich text in rticks of PolarAxis

* Update CHANGELOG.md

---------

Co-authored-by: Anshul Singhvi <asinghvi17@simons-rock.edu>
Co-authored-by: Frederic Freyer <frederic481994@hotmail.de>
Co-authored-by: Simon <sdanisch@protonmail.com>

CHANGELOG.md

@@ -6,7 +6,8 @@
 - Fixed bugs with format strings and add new features by switching to Format.jl [#3633](https://github.com/MakieOrg/Makie.jl/pull/3633).
 - Fixed an issue where CairoMakie would unnecessarily rasterize polygons [#3605](https://github.com/MakieOrg/Makie.jl/pull/3605).
 - Added `PointBased` conversion trait to `scatterlines` recipe [#3603](https://github.com/MakieOrg/Makie.jl/pull/3603).
-
+- Fixed PolarAxis `rticks` being incompatible with rich text. [#3615](https://github.com/MakieOrg/Makie.jl/pull/3615)
+- 
 ## [0.20.7] - 2024-02-04
 
 - Equalized alignment point of mirrored ticks to that of normal ticks [#3598](https://github.com/MakieOrg/Makie.jl/pull/3598).

ReferenceTests/src/tests/figures_and_makielayout.jl

@@ -224,6 +224,7 @@ end
         thetaticklabelsize = 18, thetaticklabelcolor = :blue,
         thetaticklabelstrokewidth = 1, thetaticklabelstrokecolor = :white,
         thetaticks = ([0, π/2, π, 3π/2], ["A", "B", "C", rich("D", color = :orange)]), # https://github.com/MakieOrg/Makie.jl/issues/3583
+        rticks = ([0.0, 2.5, 5.0, 7.5, 10.0], ["0.0", "2.5", "5.0", "7.5", rich("10.0", color = :orange)])
     )
     f
 end

src/makielayout/blocks/polaraxis.jl

@@ -554,7 +554,7 @@ function _polar_clip_polygon(
 end
 
 function draw_axis!(po::PolarAxis)
-    rtick_pos_lbl = Observable{Vector{<:Tuple{AbstractString, Point2f}}}()
+    rtick_pos_lbl = Observable{Vector{<:Tuple{Any, Point2f}}}()
     rtick_align = Observable{Point2f}()
     rtick_offset = Observable{Point2f}()
     rtick_rotation = Observable{Float32}()