Change version of @cloudflare/unenv-preset to minor (#12577)

Author: petebacondarwin

.changeset/native-node-v8-module.md

@@ -1,5 +1,5 @@
 ---
-"@cloudflare/unenv-preset": patch
+"@cloudflare/unenv-preset": minor
 ---
 
 Add support for the native `node:v8` module from workerd when the `enable_nodejs_v8_module` and `experimental` compatibility flags are enabled