try latest curl to see if it fixes dap test failure on OSX

Author: jswhit

config.sh

@@ -7,6 +7,7 @@
 export MACOSX_DEPLOYMENT_TARGET="10.9"
 export NETCDF_VERSION="4.7.4"
 export HDF5_VERSION="1.12.0"
+export CURL_VERSION="7.74.0"
 # old openssl, since building new version requires perl 5.10.0
 export OPENSSL_ROOT=openssl-1.0.2u
 export OPENSSL_HASH=ecd0c6ffb493dd06707d38b14bb4d8c2288bb7033735606569d8f90f89669d16