documentation: prepare for 3.1.12 release

(From yocto-docs rev: d97525982602db05e31b89a9076c93420974fd68)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/releases.rst

@@ -46,6 +46,7 @@ Release Series 3.1 (dunfell)
 - :yocto_docs:`3.1.9 Documentation </3.1.9>`
 - :yocto_docs:`3.1.10 Documentation </3.1.10>`
 - :yocto_docs:`3.1.11 Documentation </3.1.11>`
+- :yocto_docs:`3.1.12 Documentation </3.1.12>`
 
 ==========================
  Outdated Release Manuals

documentation/sphinx-static/switchers.js

@@ -6,7 +6,7 @@
     '3.4': '3.4',
     '3.3.4': '3.3.4',
     '3.2.4': '3.2.4',
-    '3.1.11': '3.1.11',
+    '3.1.12': '3.1.12',
     '3.0.4': '3.0.4',
     '2.7.4': '2.7.4',
   };