fix(spec-tests): bump spec test version in zbuild.zon to v1.7.0-alpha.2

Author: GrapeBaBa

zbuild.zon

@@ -67,7 +67,7 @@
                 .type = "string",
             },
             .spec_test_version = .{
-                .default = "v1.6.0-beta.2",
+                .default = "v1.7.0-alpha.2",
                 .type = "string",
             },
             .spec_test_out_dir = .{