bump CI to Coq 8.20 (but that has warnings)

.gitlab-ci.yml

@@ -31,8 +31,7 @@ variables:
 build-coq.8.19.1:
   <<: *template
   variables:
-    OPAM_PINS: "coq version 8.19.1"
-    DENY_WARNINGS: "1"
+    OPAM_PINS: "coq version 8.20.1"
     OPAM_PKG: "1"
     MANGLE_NAMES: "1"
   tags:
@@ -41,7 +40,7 @@ build-coq.8.19.1:
 trigger-iris.timing:
   <<: *template
   variables:
-    OPAM_PINS: "coq version 8.19.1   git+https://gitlab.mpi-sws.org/$IRIS_REPO#$IRIS_REV"
+    OPAM_PINS: "coq version 8.20.1   git+https://gitlab.mpi-sws.org/$IRIS_REPO#$IRIS_REV"
   tags:
   - fp-timing
   only:

README.md

@@ -6,7 +6,7 @@ This is a separation logic for ORC11 based on [iGPS] and [FSL]. It has been rece
 
 This version is known to compile with:
 
- - Coq 8.19.1
+ - Coq 8.20.1
  - A development version of [Iris].
 
 The easiest way to install the correct versions of the dependencies is through