cirrus: make macos image match reality (catalina)

Apparently it's actually choosing catalina anyway (see the labels
during the runs), and that appears to be all that's supported now at
https://cirrus-ci.org/guide/macOS/

Signed-off-by: Rob Browning <rlb@defaultvalue.org>

diff --git a/.cirrus.yml b/.cirrus.yml
index 5a6057a13df29ba3352d7782961517344e77f85f..0c6ee6690199c85f29d064d6b94350938d47d0c9 100644 (file)
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -110,7 +110,7 @@ task:
 task:
   name: macos (py2)
   osx_instance:
-    image: mojave-xcode-10.2
+    image: catalina-base
   script: |
     set -xe
     dev/prep-for-macos-build python2
@@ -121,7 +121,7 @@ task:
 task:
   name: macos (py3)
   osx_instance:
-    image: mojave-xcode-10.2
+    image: catalina-base
   script: |
     set -xe
     dev/prep-for-macos-build python3