Build(deps): Bump keystoneauth1 from 5.6.0 to 5.8.0 (#1806)

Bumps [keystoneauth1](https://docs.openstack.org/keystoneauth/latest/) from 5.6.0 to 5.8.0.

---
updated-dependencies:
- dependency-name: keystoneauth1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Cooper Lees <me@cooperlees.com>

requirements_swift.txt

@@ -1,3 +1,3 @@
-keystoneauth1==5.6.0
+keystoneauth1==5.8.0
 openstackclient==4.0.0
 python-swiftclient==4.6.0