Set Dependabot submodule update cadence to weekly

EliahKagan · EliahKagan · commit e998429c01f9 · 2023-10-20T07:47:10.000-04:00
This changes it from monthly to weekly. See #99 and gitpython-developers/GitPython#1702 (comment) for context.
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
@@ -8,4 +8,4 @@ updates:
 - package-ecosystem: "gitsubmodule"
   directory: "/"
   schedule:
-    interval: "monthly"
+    interval: "weekly"
