Update opam

Author: kit-ty-kate

packages/libirmin/libirmin.3.6.0/opam

@@ -22,7 +22,7 @@ dev-repo: "git+https://github.com/mirage/irmin.git"
 
 # Disabled on arm64 linux and s390x because of a SEGFAULT in tests
 # Disabled on macOS because of https://github.com/mirage/ca-certs/issues/20
-available: [ arch != "arm64" arch != "s390x" & os != "macos" ]
+available: [ arch != "arm64" & arch != "s390x" & os != "macos" ]
 url {
   src:
     "https://github.com/mirage/irmin/releases/download/3.6.0/irmin-3.6.0.tbz"