Update pexpect requirement from ~=4.6 to ~=4.9 in /requirements (#223)

Updates the requirements on [pexpect](https://github.com/pexpect/pexpect) to permit the latest version.
- [Release notes](https://github.com/pexpect/pexpect/releases)
- [Changelog](https://github.com/pexpect/pexpect/blob/master/doc/history.rst)
- [Commits](pexpect/pexpect@4.6...4.9)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/requirements.txt

@@ -1,4 +1,4 @@
-pexpect~=4.6
+pexpect~=4.9
 requests~=2.26
 json_database~=0.7
 kthread~=0.2