New versioning strategy

Per https://github.blog/changelog/2022-10-24-reduce-dependabot-version-updates-in-your-python-projects-with-the-increase-if-necessary-strategy/

Author: pythoninthegrass

.github/dependabot.yml

@@ -15,3 +15,4 @@ updates:
       time: "10:00"
       timezone: "America/Chicago"
     open-pull-requests-limit: 5
+    versioning-strategy: increase-if-necessary