make 8.12.0 the timing build

.gitlab-ci.yml

@@ -39,15 +39,15 @@ build-coq.8.12.0:
   variables:
     OPAM_PINS: "coq version 8.12.0"
     DENY_WARNINGS: "1"
+    OPAM_PKG: "coq-stdpp"
+    DOC_DIR: "coqdoc@center.mpi-sws.org:stdpp"
+  tags:
+  - fp-timing
 
 build-coq.8.11.2:
   <<: *template
   variables:
     OPAM_PINS: "coq version 8.11.2"
-    OPAM_PKG: "coq-stdpp"
-    DOC_DIR: "coqdoc@center.mpi-sws.org:stdpp"
-  tags:
-  - fp-timing
 
 build-coq.8.10.2:
   <<: *template