Bump package version to 0.6.0 (#1109)

### Summary

Incrementing the version after 0.5 release. In addition to the places we
usually update, `CITATION.cff` needs to be updated with the latest
release and doi. The mergify target branch has been updated as well.

Author: coruscating

.mergify.yml

@@ -6,4 +6,4 @@ pull_request_rules:
     actions:
       backport:
         branches:
-          - stable/0.4
+          - stable/0.5

CITATION.cff

@@ -21,7 +21,7 @@ authors:
   given-names: "Christopher J."
   orcid: "https://orcid.org/0000-0001-7606-7349"
 title: "Qiskit Experiments"
-version: 0.4.0
-doi: 10.5281/zenodo.7737486
-date-released: 2022-08-16
+version: 0.5.0
+doi: 10.5281/zenodo.7779295
+date-released: 2022-03-28
 url: "https://github.com/Qiskit/qiskit-experiments"

docs/conf.py

@@ -36,9 +36,9 @@
 
 # -- Project information -----------------------------------------------------
 # The short X.Y version
-version = "0.5"
+version = "0.6"
 # The full version, including alpha/beta/rc tags
-release = "0.5.0"
+release = "0.6.0"
 project = f"Qiskit Experiments {version}"
 copyright = f"2021-{datetime.date.today().year}, Qiskit Development Team"  # pylint: disable=redefined-builtin
 author = "Qiskit Development Team"

qiskit_experiments/VERSION.txt

@@ -1 +1 @@
-0.5.0
+0.6.0