Add dependabot dependent version updates (#1064)

* Add dependabot yaml

* Add target branch

* Monthly, only major intervals

---------

Co-authored-by: misi9170 <michael.sinner@nrel.gov>

Author: paulf81

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+- package-ecosystem: "pip"
+  directory: "/" # Location of package manifests
+  target-branch: "develop"
+  schedule:
+    interval: "monthly"
+  ignore:
+    - dependency-name: "*"
+      update-types: ["version-update:semver-minor", "version-update:semver-patch"]