Bump tap from 15.0.2 to 15.0.6

Bumps [tap](https://github.com/tapjs/node-tap) from 15.0.2 to 15.0.6.
- [Release notes](https://github.com/tapjs/node-tap/releases)
- [Commits](https://github.com/tapjs/node-tap/compare/v15.0.2...v15.0.6)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -37,7 +37,7 @@
     "highlight.js": "^10.6.0",
     "husky": "^4.2.5",
     "marked": "^2.0.0",
-    "tap": "15.0.2"
+    "tap": "15.0.6"
   },
   "scripts": {
     "test": "tap --no-cov",