fix(deps): update dredd-transactions requirement from 9.0.4 to 9.0.6

Updates the requirements on [dredd-transactions](https://github.com/apiaryio/dredd-transactions) to permit the latest version.
- [Release notes](https://github.com/apiaryio/dredd-transactions/releases)
- [Commits](apiaryio/dredd-transactions@v9.0.4...v9.0.6)

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

package.json

@@ -43,7 +43,7 @@
     "chai": "4.2.0",
     "clone": "2.1.2",
     "cross-spawn": "6.0.5",
-    "dredd-transactions": "9.0.4",
+    "dredd-transactions": "9.0.6",
     "gavel": "8.0.1",
     "glob": "7.1.4",
     "html": "1.0.0",