fix: Update and remove GeekMasher from Codeowner

Author: GeekMasher

.github/CODEOWNERS

@@ -1 +1,3 @@
-* @GeekMasher
+# Codeowners
+
+* @advanced-security/oss-maintainers

.github/dependabot.yml

@@ -0,0 +1,42 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    reviewers:
+      - "advanced-security/oss-maintainers"
+    target-branch: "main"
+    commit-message:
+      prefix: deps
+      prefix-development: chore
+    labels:
+      - "Dependencies"
+    groups:
+      production-dependencies:
+        dependency-type: "production"
+      development-dependencies:
+        dependency-type: "development"
+
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    reviewers:
+      - "advanced-security/oss-maintainers"
+    target-branch: "main"
+    commit-message:
+      prefix: deps
+      prefix-development: chore
+    labels:
+      - "Dependencies"
+    groups:
+      production-dependencies:
+        dependency-type: "production"
+      development-dependencies:
+        dependency-type: "development"