[6.0] 4833a4f18 vtc: Work around 32bit workspace alignment in v58

[Dridi Boukelmoune]

commit 4833a4f1829e6c8d5bcb81ba97fe7543279c5e40
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Thu Jun 20 12:32:20 2024 +0200

    vtc: Work around 32bit workspace alignment in v58

diff --git a/bin/varnishtest/tests/v00058.vtc b/bin/varnishtest/tests/v00058.vtc
index 1a3f9cbd8..748c48df0 100644
--- a/bin/varnishtest/tests/v00058.vtc
+++ b/bin/varnishtest/tests/v00058.vtc
@@ -139,7 +139,7 @@ varnish v1 -vcl+backend {
 		set req.http.Baz = "baz";
 		set req.http.Quux = "quux";
 
-		vtc.workspace_alloc(client, -12);
+		vtc.workspace_alloc(client, -11);
 
 		if (req.url == "/1") {
 			# VRT_StrandsWS() marks the WS as overflowed,