fix: use correct Dependabot ignore syntax (#19)

Author: greatislander

.github/dependabot.yml

@@ -7,10 +7,10 @@ updates:
     allow:
       - dependency-type: direct
     ignore:
-      - dependency-name: stylelint
-        versions: [^15]
       - dependency-name: react
-        versions: [^17]
+        versions: [">16"]
+      - dependency-name: stylelint
+        versions: [">14"]
   - package-ecosystem: github-actions
     directory: /
     schedule: