Python dependency: Bump paramiko from 3.5.1 to 4.0.0 in /web/regression

Bumps [paramiko](https://github.com/paramiko/paramiko) from 3.5.1 to 4.0.0.
- [Commits](https://github.com/paramiko/paramiko/compare/3.5.1...4.0.0)

---
updated-dependencies:
- dependency-name: paramiko
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -39,7 +39,7 @@ jsonformatter~=0.3.4
 keyring==25.*
 ldap3==2.*
 libgravatar==1.0.*
-paramiko==3.5.1
+paramiko==4.0.0
 passlib==1.*
 psutil==7.0.*
 psycopg[c]==3.2.9