README.md: sync eol confluence versions

Confluence versions before 7.18 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]>
sphinx-contrib · Mar 30, 2024 · f2214cf · f2214cf
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@@ -10,7 +10,7 @@ files and optionally publish them to a Confluence instance.
 
 ## Requirements
 
-* [Confluence][confluence] Cloud or Data Center / Server 7.16+
+* [Confluence][confluence] Cloud or Data Center / Server 7.18+
 * [Python][python] 3.8+
 * [Requests][requests] 2.14.0+
 * [Sphinx][sphinx] 6.1+