build(deps-dev): bump @solana/spl-token in /token-swap/js (#1963)

Bumps [@solana/spl-token](https://github.com/solana-labs/solana-program-library) from 0.1.5 to 0.1.6.
- [Release notes](https://github.com/solana-labs/solana-program-library/releases)
- [Commits](https://github.com/solana-labs/solana-program-library/compare/@solana/spl-token@v0.1.5...@solana/spl-token@v0.1.6)

---
updated-dependencies:
- dependency-name: "@solana/spl-token"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

token-swap/js/package-lock.json

@@ -58,7 +58,7 @@
     "mkdirp": "1.0.4"
   },
   "devDependencies": {
-    "@solana/spl-token": "0.1.5",
+    "@solana/spl-token": "0.1.6",
     "@types/bn.js": "^5.1.0",
     "eslint": "^7.9.0",
     "eslint-plugin-import": "^2.22.0",