Bump pexpect from 4.7.0 to 4.8.0 (#4846)

* Bump pexpect from 4.7.0 to 4.8.0

Bumps [pexpect](https://github.com/pexpect/pexpect) from 4.7.0 to 4.8.0.
- [Release notes](https://github.com/pexpect/pexpect/releases)
- [Commits](pexpect/pexpect@4.7.0...4.8.0)

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

* Remove both pexpect and ptyprocess as unused

https://github.com/pexpect

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

requirements.txt

@@ -11,10 +11,8 @@ jsonpatch==0.4
 meld3==2.0.1
 ndg-httpsclient==0.5.1
 pathlib2==2.3.5
-pexpect==4.7.0
 pickleshare==0.7.5
 prompt-toolkit==1.0.9
-ptyprocess==0.5.1
 py==1.10.0
 pyOpenSSL==20.0.1
 pyasn1==0.4.8