deps: bump minimum icu version to 65

Bump minimum version of ICU needed to build node to 65.

Refs: v8/v8@74bf96e

Author: targos

tools/icu/icu_versions.json

@@ -1,3 +1,3 @@
 {
-    "minimum_icu": 64
+    "minimum_icu": 65
 }