deps: bump minimum icu version to 63

Bump minimum version of ICU needed to build node to 63.

Refs: 30a350f298
Co-authored-by: Steven R Loomis <srloomis@us.ibm.com>

PR-URL: https://github.com/nodejs/node/pull/25852
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

tools/icu/icu_versions.json

@@ -1,3 +1,3 @@
 {
-    "minimum_icu": 57
+    "minimum_icu": 63
-}
+}