Switch the Travis build to use osx_image: xcode12.5, in an attempt to avoid timeouts...

diff --git a/.travis.yml b/.travis.yml
index 08772c15b55a41b02db8371515c31d6083bd9b3e..bfc7002b90ca3085d47661d72fc006325536151f 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -79,7 +79,7 @@ matrix:
       osx_image: xcode9.4
       env: XCODE="true"
     - os: osx
-      osx_image: xcode10.1
+      osx_image: xcode12.5
       env: XCODE="true" CHECK="true"
 
 # run coveralls