chore(deps): update dependency testem to v3.14.0

Author: renovate[bot]

package.json

@@ -74,7 +74,7 @@
     "spawn-pouchdb-server": "3.3.3",
     "standardx": "7.0.0",
     "tape": "5.2.2",
-    "testem": "3.4.2",
+    "testem": "3.14.0",
     "typedoc": "0.21.2",
     "typedoc-plugin-external-module-name": "4.0.6",
     "typescript": "4.3.5"