MTL-1253 Dependabot remove vendor (#27)

From documentation, `vendor` should not be set or this will fail.

Signed-off-by: Russell Bunch <doomslayer@hpe.com>

.github/dependabot.yml

@@ -6,8 +6,6 @@
 version: 2
 updates:
   - package-ecosystem: "gomod"
-    # Raise pull requests to update vendored dependencies that are checked in to the repository
-    vendor: true
     directory: "/"
     schedule:
       interval: "weekly"