Bump python-swiftclient from 3.11.1 to 3.12.0

Bumps [python-swiftclient](https://github.com/openstack/swift) from 3.11.1 to 3.12.0.
- [Release notes](https://github.com/openstack/swift/releases)
- [Changelog](https://github.com/openstack/swift/blob/master/CHANGELOG)
- [Commits](https://github.com/openstack/swift/commits)

---
updated-dependencies:
- dependency-name: python-swiftclient
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 aiohttp==3.7.4.post0
 requests==2.25.1
-python-swiftclient==3.11.1
+python-swiftclient==3.12.0
 keystoneauth1==4.3.1
 git+https://github.com/cscfi/swift-browser-ui.git
 certifi==2020.12.05 

setup.py

@@ -15,7 +15,7 @@
     install_requires=[
         "aiohttp==3.7.4.post0",
         "requests==2.25.1",
-        "python-swiftclient==3.11.1",
+        "python-swiftclient==3.12.0",
         "keystoneauth1==4.3.1",
         "gunicorn>=20.0.1",
         "uvloop==0.15.2",