chore(deps): bump ipython from 7.17.0 to 7.18.0 in /tests

Bumps [ipython](https://github.com/ipython/ipython) from 7.17.0 to 7.18.0.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@7.17.0...7.18.0)

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

Author: dependabot-preview[bot]

tests/requirements.txt

@@ -6,7 +6,7 @@ flake8-isort==4.0.0
 flake8-string-format==0.3.0
 flake8-tuple==0.4.1
 gitlint==0.13.1
-ipython==7.17.0
+ipython==7.18.0
 isort==5.4.2
 pexpect==4.8.0
 pre-commit==2.7.1