Revert "fix(ec2): too long CIDR for "any" IPv6 (#5065)" (#5178)

This reverts commit 1d95cb7.

This should not have been merged at this point.

Author: rix0rrr

packages/@aws-cdk/aws-ec2/README.md

@@ -300,7 +300,7 @@ There are various classes that implement the connection peer part:
 // Simple connection peers
 let peer = ec2.Peer.ipv4("10.0.0.0/16");
 let peer = ec2.Peer.anyIpv4();
-let peer = ec2.Peer.ipv6("::/0");
+let peer = ec2.Peer.ipv6("::0/0");
 let peer = ec2.Peer.anyIpv6();
 let peer = ec2.Peer.prefixList("pl-12345");
 fleet.connections.allowTo(peer, ec2.Port.tcp(443), 'Allow outbound HTTPS');

packages/@aws-cdk/aws-ec2/lib/peer.ts

@@ -159,7 +159,7 @@ class CidrIPv6 implements IPeer {
  */
 class AnyIPv6 extends CidrIPv6 {
   constructor() {
-    super("::/0");
+    super("::0/0");
   }
 }
 

packages/@aws-cdk/cloudformation-diff/test/network/test.rule.ts

@@ -26,12 +26,12 @@ export = {
 
   'can parse cidr-ip 6'(test: Test) {
     const rule = new SecurityGroupRule({
-      CidrIpv6: '::/0'
+      CidrIpv6: '::0/0'
     });
 
     const peer = rule.peer!;
     if (peer.kind !== 'cidr-ip') { throw new Error('Fail'); }
-    test.equal(peer.ip, '::/0');
+    test.equal(peer.ip, '::0/0');
 
     test.done();
   },