[python]: Update entry-points-txt requirement from ~=0.1.0 to >=0.1,<0.3

Updates the requirements on [entry-points-txt](https://github.com/jwodder/entry-points-txt) to permit the latest version.
- [Release notes](https://github.com/jwodder/entry-points-txt/releases)
- [Changelog](https://github.com/wheelodex/entry-points-txt/blob/master/CHANGELOG.md)
- [Commits](wheelodex/entry-points-txt@v0.1.0...v0.2.0)

---
updated-dependencies:
- dependency-name: entry-points-txt
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -42,7 +42,7 @@ classifiers = [
 
 dependencies = [
     "attrs            >= 18.1",
-    "entry-points-txt ~= 0.1.0",
+    "entry-points-txt >= 0.1,< 0.3",
     "headerparser     ~= 0.4.0",
     "packaging        >= 17.1",
     "readme_renderer  >= 24.0",