fix: invalid dependabot configuration for update types in groups

The `applies-to` field in the `all-dependencies` group expects a string
and not an array of strings. Grouping both security and version updates
is not supported by Dependabot. Split the two types of updates into
their own distinct group.
Signed-off-by: Ivin Joel Abraham <ivinjabraham@gmail.com>

Author: ivinjabraham

.github/dependabot.yml

@@ -7,7 +7,12 @@ updates:
     open-pull-requests-limit: 1
     target-branch: "develop"
     groups:
-      all-dependencies:
-        applies-to: [version-updates, security-updates]
+      version-updates:
+        applies-to: "version-updates"
+        patterns:
+          - "*"
+
+      security-updates:
+        applies-to: "security-updates"
         patterns:
           - "*"