[monitoring-plugins] Remove IPv6 test, since we don't have that

[RincewindsHat]

 Module: monitoring-plugins
 Branch: check_icmp_buffer_offerflow
 Commit: abb4f02b4a4f6a5d808b9a7506f9cc4c6824415b
 Author: RincewindsHat <12514511+RincewindsHat at users.noreply.github.com>
   Date: Mon Jan 24 23:21:46 2022 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=abb4f02

Remove IPv6 test, since we don't have that

---

 plugins-root/t/check_icmp.t | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/plugins-root/t/check_icmp.t b/plugins-root/t/check_icmp.t
index 1e5818a..2fe0513 100644
--- a/plugins-root/t/check_icmp.t
+++ b/plugins-root/t/check_icmp.t
@@ -88,9 +88,3 @@ $res = NPTest->testCmd(
 	);
 is( $res->return_code, 0, "Try max paket size" );
 like( $res->output, $successOutput, "Output OK - Didn't overflow" );
-
-$res = NPTest->testCmd(
-	"$sudo ./check_icmp -H ::1 -vvv"
-	);
-is( $res->return_code, 0, "Try IPv6 and vvv" );
-like( $res->output, $successOutput, "Output OK - Didn't overflow" );