package/gdal fix config issue with +pg for newer gdal (#30421)

* package/gdal fix config issue with +pg for newer gdal

* fix version logic

* improve style

Co-authored-by: sbulut <sbulut@3vgeomatics.com>

var/spack/repos/builtin/packages/gdal/package.py

@@ -322,8 +322,11 @@ def configure_args(self):
             args.append('--with-liblzma=no')
 
         if '+pg' in spec:
+            if spec.satisfies('@:2'):
                 args.append('--with-pg={0}'.format(
                     spec['postgresql'].prefix.bin.pg_config))
+            else:
+                args.append('--with-pg=yes')
         else:
             args.append('--with-pg=no')