fix: upgrade int64-buffer from 1.0.1 to 1.1.0

Snyk has created this PR to upgrade int64-buffer from 1.0.1 to 1.1.0.

See this package in npm:
int64-buffer

See this project in Snyk:
https://app.snyk.io/org/rayston92/project/ddf6b90c-8734-485d-b567-9ab1d59b0110?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -63,7 +63,7 @@
     "bs58": "^6.0.0",
     "bs58check": "^4.0.0",
     "create-hmac": "^1.1.7",
-    "int64-buffer": "^1.0.1",
+    "int64-buffer": "^1.1.0",
     "pushdata-bitcoin": "^1.0.1",
     "tiny-secp256k1": "^1.1.6",
     "typeforce": "^1.18.0",