bump the Coq we test

.gitlab-ci.yml

@@ -28,10 +28,10 @@ variables:
 
 ## Build jobs
 
-build-coq.8.13.0:
+build-coq.8.15.1:
   <<: *template
   variables:
-    OPAM_PINS: "coq version 8.13.0"
+    OPAM_PINS: "coq version 8.15.1"
     DENY_WARNINGS: "1"
   tags:
   - fp-timing
@@ -41,7 +41,7 @@ trigger-iris.dev:
   variables:
     STDPP_REPO: "iris/stdpp"
     IRIS_REPO: "iris/iris"
-    OPAM_PINS: "coq version 8.13.dev   git+https://gitlab.mpi-sws.org/$STDPP_REPO#$STDPP_REV   git+https://gitlab.mpi-sws.org/$IRIS_REPO#$IRIS_REV"
+    OPAM_PINS: "coq version 8.15.dev   git+https://gitlab.mpi-sws.org/$STDPP_REPO#$STDPP_REV   git+https://gitlab.mpi-sws.org/$IRIS_REPO#$IRIS_REV"
   except:
   only:
   - triggers

README.md

@@ -10,7 +10,7 @@ See the small ReLoC [docs/guide.md](docs/guide.md) and the Iris [ProofGuide.md](
 
 ## Building
 
-This project has been tested with Coq 8.13.0.
+This project has been tested with Coq 8.15.1.
 
 ### OPAM