Fix devel build?

Author: foosel

.github/workflows/docs.yaml

@@ -47,9 +47,9 @@ jobs:
           - version: "devel"
             source: "heads"
             python: "3.7"
-            sphinx: "3.5.4"
-            mermaid: "0.6.3"
-            jinja: "3.0.3"
+            sphinx: "4.5.0"
+            mermaid: "0.7.1"
+            jinja: "3.1.1"
             mermaid_fix: "true"
     steps:
       - name: 🧾 Log event & matrix