sync eol confluence versions

Confluence versions before 8.5 have reached end-of-life and will not be
tested in next release cycle system tests; updating to the oldest
version supported.

Signed-off-by: James Knight <[email protected]>

Author: jdknight

README.md

@@ -10,7 +10,7 @@ files and optionally publish them to a Confluence instance.
 
 ## Requirements
 
-* [Confluence][confluence] Cloud or Data Center 8.1+
+* [Confluence][confluence] Cloud or Data Center 8.5+
 * [Python][python] 3.9+
 * [Requests][requests] 2.25.0+
 * [Sphinx][sphinx] 7.3+

doc/conf.py

@@ -17,7 +17,7 @@
 version = sphinxcontrib.confluencebuilder.__version__
 release = sphinxcontrib.confluencebuilder.__version__
 
-supported_confluence_ver = '8.1+'
+supported_confluence_ver = '8.5+'
 supported_python_ver = '3.9+'
 supported_requests_ver = '2.25.0+'
 supported_sphinx_ver = '7.3+'