build(deps): bump proxmoxer from 1.3.1 to 2.1.0

Bumps [proxmoxer](https://github.com/proxmoxer/proxmoxer) from 1.3.1 to 2.1.0.
- [Release notes](https://github.com/proxmoxer/proxmoxer/releases)
- [Changelog](https://github.com/proxmoxer/proxmoxer/blob/develop/CHANGELOG.md)
- [Commits](proxmoxer/proxmoxer@1.3.1...2.1.0)

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

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

requirements.in

@@ -1,7 +1,7 @@
 cloudscale-sdk
 cs
 hcloud
-proxmoxer<2.0
+proxmoxer<3.0
 python-digitalocean
 python-dotenv
 python-json-logger

requirements.txt

@@ -5,7 +5,7 @@ cs==3.2.0
 hcloud==2.2.1
 idna==3.7
 jsonpickle==3.0.2
-proxmoxer==1.3.1
+proxmoxer==2.1.0
 python-dateutil==2.8.2
 python-digitalocean==1.17.0
 python-dotenv==1.0.1