chore(deps-dev): bump koa (#23)

Automatic merge of Dependabot PR

Author: dependabot[bot]

plugins/node/opentelemetry-instrumentation-koa/package.json

@@ -56,7 +56,7 @@
     "@types/mocha": "7.0.2",
     "@types/node": "16.11.21",
     "gts": "3.1.0",
-    "koa": "3.0.3",
+    "koa": "3.1.2",
     "mocha": "7.2.0",
     "nyc": "15.1.0",
     "rimraf": "3.0.2",