Remove deprecated distutils code.

Author: tshead2

pyproject.toml

@@ -23,6 +23,7 @@ dependencies = [
         "custom_inherit",
         "multipledispatch",
         "numpy>=1.8.0",
+	"packaging",
         "pypng",
         "reportlab",
 ]

toyplot/reportlab/png.py

@@ -6,10 +6,10 @@
 """
 
 
-import distutils.version
 import io
 import subprocess
 
+from packaging.version import Version
 import reportlab.pdfgen.canvas
 
 import toyplot.reportlab
@@ -29,7 +29,7 @@
 if _gs_command is None:
     raise Exception("A ghostscript executable is required.")  # pragma: no cover
 
-if distutils.version.StrictVersion(_gs_version) >= "9.14":
+if Version(_gs_version) >= Version("9.14"):
     _gs_resolution = ["-r%s" % (96 * 4), "-dDownScaleFactor=4"]
 else: # pragma: no cover
     _gs_resolution = ["-r%s" % (96)]