Upgrade to OCamlformat 0.26.1

Changelog can be found here: https://github.com/ocaml-ppx/ocamlformat/blob/main/CHANGES.md

Author: Julow

.ocamlformat

@@ -1,3 +1,3 @@
-version=0.26.0
+version=0.26.1
 profile=conventional
 ocaml-version=4.08.0