Update newrelic requirement from <8.8.1,>=8.4.0 to >=8.4.0,<9.1.2

Updates the requirements on [newrelic](https://github.com/newrelic/newrelic-python-agent) to permit the latest version.
- [Release notes](https://github.com/newrelic/newrelic-python-agent/releases)
- [Commits](newrelic/newrelic-python-agent@v8.4.0...v9.1.1)

---
updated-dependencies:
- dependency-name: newrelic
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -42,7 +42,7 @@ online = [
     "requests>=2.28,<2.32",
     "gunicorn>=20.0,<20.2",
     "sentry-sdk[flask]>=1.0,<1.30",
-    "newrelic>=8.4.0,<8.8.1",
+    "newrelic>=8.4.0,<9.1.2",
     "gitpython>=3.0.0,<3.2"
 ]
 gui = [