Bump sendgrid from 6.0.4 to 6.9.7 in /src

Bumps [sendgrid](https://github.com/sendgrid/sendgrid-python) from 6.0.4 to 6.9.7.
- [Release notes](https://github.com/sendgrid/sendgrid-python/releases)
- [Changelog](https://github.com/sendgrid/sendgrid-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sendgrid/sendgrid-python/commits/6.9.7)

---
updated-dependencies:
- dependency-name: sendgrid
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/Pipfile

@@ -42,6 +42,6 @@ PyJWT = "==2.3.0"
 pyOpenSSL = "==19.1.0"
 python-dateutil = "==2.8.1"
 requests-toolbelt = "==0.9.1"
-sendgrid = "==6.0.4"
+sendgrid = "==6.9.7"
 pygithub = "==1.55"
 werkzeug = "==2.0.3"