build: Bump version number to 0.5.0 for matplotlib

- We previously published v0.4.0 for @deephaven/js-plugin-matplotlib over a year ago
- We are now packaging the JS with python, and when we did that we updated Python to 0.4.0.dev0
- Release script is failing because there's no changes on @deephaven/js-plugin-matplotlib
- Just bump to 0.5.0 and we'll re-publish again so the action runs properly

plugins/matplotlib/setup.cfg

@@ -3,7 +3,7 @@ name = deephaven-plugin-matplotlib
 description = Deephaven Plugin for matplotlib
 long_description = file: README.md
 long_description_content_type = text/markdown
-version = 0.4.0.dev0
+version = 0.5.0.dev0
 url = https://github.com/deephaven/deephaven-plugins
 project_urls =
     Source Code = https://github.com/deephaven/deephaven-plugins

plugins/matplotlib/src/js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@deephaven/js-plugin-matplotlib",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Deephaven matplotlib plugin",
   "keywords": [
     "Deephaven",