update dependencies

opam

@@ -9,6 +9,6 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: ["rm" "-rf" "%{lib}%/coq/user-contrib/reloc"]
 depends: [
-  "coq-iris-heap-lang" { (= "dev.2021-02-16.0.8ee71fff") | (= "dev") }
+  "coq-iris-heap-lang" { (= "dev.2021-04-22.1.35e8d8d7") | (= "dev") }
   "coq-autosubst" { = "dev" }
 ]