Fix deprecation warning on Matplotlib 3.7 and above

Raise minimum matplotlib version to 3.5 (still supported on Python 3.8
on Windows 7).

This fixes support with future Matplotlib 3.9, which removes
matplotlib.cm.get_cmap(). Newer versions of dependencies may be chosen
when installing corrscope using pip/pipx and wheels, rather than Poetry
or official binaries (which always use locked dependencies).

corrscope/renderer.py

@@ -580,7 +580,7 @@ class AbstractMatplotlibRenderer(_RendererBackend, ABC):
             # List of colors at
             # https://matplotlib.org/gallery/color/colormap_reference.html
             # Discussion at https://github.com/matplotlib/matplotlib/issues/10840
-            cmap: ListedColormap = matplotlib.cm.get_cmap("Accent")
+            cmap: ListedColormap = matplotlib.colormaps["Accent"]
             colors = cmap.colors
             axes.set_prop_cycle(color=colors)
 

poetry.lock

@@ -1311,4 +1311,4 @@ qt6 = ["PyQt6"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "b5adece2ad1161acc71ae3612c339131e9c5c5b545e48ba6c6724ac8bad6446c"
+content-hash = "cb73596aed629b4f95d99c079bc01bfe75f161973659e13cfcde8486baef5774"

pyproject.toml

@@ -23,7 +23,7 @@ python = "^3.8"
 "ruamel.yaml" = "^0.17"
 numpy = "^1.21"
 click = "^8.0.1"
-matplotlib = "^3.1"
+matplotlib = "^3.5"
 attrs = "^21.2.0"
 appdirs = "^1.4.4"
 atomicwrites = "^1.4.0"