Update documentation requirements (#402) (#5)

* Bump rocm-docs-core to 1.8.2

* Remove empty package-ecosystem in dependabot

Co-authored-by: Sam Wu <22262939+samjwu@users.noreply.github.com>

.github/dependabot.yml

@@ -5,11 +5,6 @@
 
 version: 2
 updates:
-  - package-ecosystem: "" # See documentation for possible values
-    directory: "/" # Location of package manifests
-    schedule:
-      interval: "weekly"
-
   - package-ecosystem: "pip" # See documentation for possible values
     directory: "/docs/sphinx" # Location of package manifests
     open-pull-requests-limit: 10