Bump mkdocs-material from 6.2.5 to 6.2.8 (#747)

dependabot[bot] · web-flow · commit 702009ac2033 · 2021-02-12T20:06:02.000+01:00
diff --git a/requirements/requirements_doc.txt b/requirements/requirements_doc.txt
@@ -1,2 +1,2 @@
 mkdocs==1.1.2
-mkdocs-material==6.2.5
+mkdocs-material==6.2.8
