(Blindly) tweak new test regex

gcc-based Windows buildfarm animals are not happy about a multiline
regular expression I added recently.  Try to accomodate; existing
pg_basebackup tests suggest that \n should work instead of a bare
newline, but throw in \r also.  This being perl, TIMTOWTDI.
Also remove the pointless $ at the end of the pattern, for extra luck.

(If this doesn't work, I'll probably just split the regex in two.)

Per buildfarm members jacana and fairywren.

Discussion: https://postgr.es/m/3562.1576161217@sss.pgh.pa.us

src/bin/pgbench/t/001_pgbench_with_server.pl

@@ -296,8 +296,7 @@ pgbench(
 		[],
 		[
 		qr{ERROR:  invalid input syntax for type json},
-		qr[CONTEXT:  JSON data, line 1: \{ invalid\.\.\.
-extended query with parameters: \$1 = '\{ invalid ', \$2 = '''Valame Dios!'' dijo Sancho; ''no le dije yo a vuestra merced que ...'$]m
+		qr[CONTEXT:  JSON data, line 1: \{ invalid\.\.\.[\r\n]+extended query with parameters: \$1 = '\{ invalid ', \$2 = '''Valame Dios!'' dijo Sancho; ''no le dije yo a vuestra merced que \.\.\.']m
 		],
 		'server parameter logging',
 		{