Change Travis-ci macOS image to 11.3 and use included Qt5.14.1

Temporary workaround for #3611
[publish binaries]

.travis.yml

@@ -37,7 +37,7 @@ env:
 jobs:
   include:
   - os: osx
-    osx_image: xcode10.1
+    osx_image: xcode11.3
     compiler: clang
   - os: linux
     dist: xenial

travis/osx/after_success.sh

@@ -67,7 +67,7 @@ aws s3 rm s3://goldencheetah-binaries/MacOS --recursive # keep only the last one
 aws s3 cp --acl public-read $FINAL_NAME s3://goldencheetah-binaries/MacOS/$FINAL_NAME
 aws s3 cp --acl public-read GCversionMacOS.txt s3://goldencheetah-binaries/MacOS/GCversionMacOS.txt
 else
-curl --max-time 60 --upload-file $FINAL_NAME https://transfer.sh/$FINAL_NAME
+curl --max-time 300 --upload-file $FINAL_NAME https://transfer.sh/$FINAL_NAME
 fi
 
 echo "Make sure we are back in the Travis build directory"

travis/osx/before_install.sh

@@ -1,14 +1,14 @@
 #!/bin/bash
 set -ev
 
-## try early just to check, can delete later
 date
+# Don't update to use included Qt version instead of Qt 5.15.x
+export HOMEBREW_NO_AUTO_UPDATE=1
 export HOMEBREW_NO_INSTALL_CLEANUP=1
-brew update
 
 brew unlink python@2 # to avoid conflicts with qt/libical dependence on python
 
-brew upgrade qt5 # to get 5.15.0
+#brew upgrade qt5 # to get 5.15.x
 /usr/local/opt/qt5/bin/qmake --version
 
 brew install gsl