Update dependency git-changelog to ^0.6.0

Author: renovate[bot]

pyproject.toml

@@ -70,7 +70,7 @@ six = "^1.14"
 Django = {version = "^3.2.14"}
 check-manifest = {version = "^0.48", python = "^3.6"}
 bump2version = {version = "^1.0.0", python = "^3.6"}
-git-changelog = {version = "^0.5.0", python = "^3.6.2"}
+git-changelog = {version = "^0.6.0", python = "^3.6.2"}
 poetry = "=1.1.14"
 sphinx = "=5.0.0"
 sphinx-autobuild = "^2021.0.0"