chore(NODE-7215): remove unnecessary dependabot ignore configuration (#4697)

Author: baileympearson

.github/dependabot.yml

@@ -27,9 +27,6 @@ updates:
       # chai-subset requires @types/chai 4.x.
       - dependency-name: "@types/chai"
         versions: [">=4.0.0"]
-      # nyc is Node18+ only starting on [email protected].
-      - dependency-name: "nyc"
-        versions: [">=16.0.0"]
       # mocha-plugin-eslint breaks our lint configuration
       - dependency-name: "mocha-plugin-eslint"
         versions: [">=10.0.0"]