chore(deps-dev): bump https-proxy-agent from 7.0.6 to 9.0.0

Bumps [https-proxy-agent](https://github.com/TooTallNate/proxy-agents/tree/HEAD/packages/https-proxy-agent) from 7.0.6 to 9.0.0.
- [Changelog](https://github.com/TooTallNate/proxy-agents/blob/main/packages/https-proxy-agent/CHANGELOG.md)
- [Commits](https://github.com/TooTallNate/proxy-agents/commits/https-proxy-agent@9.0.0/packages/https-proxy-agent)

---
updated-dependencies:
- dependency-name: https-proxy-agent
  dependency-version: 9.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/http-client/package.json

@@ -48,7 +48,7 @@
   "devDependencies": {
     "@sap-cloud-sdk/test-util-internal": "workspace:^",
     "depcheck": "^1.4.7",
-    "https-proxy-agent": "^7.0.6",
+    "https-proxy-agent": "^9.0.0",
     "jsonwebtoken": "^9.0.3",
     "nock": "^14.0.11",
     "prettier": "^3.8.1",