build(deps-dev): bump rollup from 2.26.8 to 2.26.9 (vuejs#2031)

Author: dependabot-preview[bot]

yarn.lock

@@ -6281,9 +6281,9 @@ rollup-pluginutils@^2.3.1:
     estree-walker "^0.6.1"
 
 rollup@^2.16.1:
-  version "2.26.8"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.26.8.tgz#7b02353835a73c4797f42177a5fa3fc074012713"
-  integrity sha512-li9WaJYc5z9WzV1jhZbPQCrsOpGNsI+Li1qyrn5n745ZNSnlkRlBtj1Hs+Z0Dc2N1+P7HT34UKAEASqN9Th8cg==
+  version "2.26.9"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.26.9.tgz#4b6ce4e9044dd257d7314d8ed9b4d4d8a7d166c9"
+  integrity sha512-XIiWYLayLqV+oY4S2Lub/shJq4uk/QQLwWToYCL4LjZbYHbFK3czea4UDVRUJu+zNmKmxq5Zb/OG7c5HSvH2TQ==
   optionalDependencies:
     fsevents "~2.1.2"