Bump acorn from 6.3.0 to 6.4.1 in /js/explorer

Bumps [acorn](https://github.com/acornjs/acorn) from 6.3.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@6.3.0...6.4.1)

Signed-off-by: dependabot[bot] <[email protected]>

js/explorer/yarn.lock

@@ -1245,15 +1245,10 @@ acorn-walk@^6.1.1:
   resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.2.0.tgz#123cb8f3b84c2171f1f7fb252615b1c78a6b1a8c"
   integrity sha512-7evsyfH1cLOCdAzZAd43Cic04yKydNx0cF+7tiA19p1XnLLPU4dpCQOqpjqwokFe//vS0QqfqqjCS2JkiIs0cA==
 
-acorn@^6.0.2:
-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.3.0.tgz#0087509119ffa4fc0a0041d1e93a417e68cb856e"
-  integrity sha512-/czfa8BwS88b9gWQVhc8eknunSA2DoJpJyTQkhheIf5E48u1N0R4q/YxxsAeqRrmK9TQ/uYfgLDfZo91UlANIA==
-
-acorn@^6.0.7, acorn@^6.1.1, acorn@^6.2.1:
-  version "6.4.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.0.tgz#b659d2ffbafa24baf5db1cdbb2c94a983ecd2784"
-  integrity sha512-gac8OEcQ2Li1dxIEWGZzsp2BitJxwkwcOm0zHAJLcPJaVvm58FRnk6RkuLRpU1EujipU2ZFODv2P9DLMfnV8mw==
+acorn@^6.0.2, acorn@^6.0.7, acorn@^6.1.1, acorn@^6.2.1:
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
+  integrity sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==
 
 address@^1.1.2:
   version "1.1.2"
@@ -9063,5 +9058,14 @@ zksync-crypto@^0.0.2:
   integrity sha512-dT6KnrNj8MtbhBRk41Xsr8S2DwSOgfWD0Ym8YmWi+gTHKF3l8/4dzCxRj4iTI8AClnhUv//FHnb6g2/ZeaaVGQ==
 
 "zksync@link:../zksync.js":
-  version "0.0.0"
-  uid ""
+  version "0.5.0"
+  dependencies:
+    axios "^0.19.0"
+    blake2b "^2.1.3"
+    bn.js "^5.0.0"
+    crypto-js "^3.1.9-1"
+    elliptic "^6.5.0"
+    js-sha256 "^0.9.0"
+    websocket "^1.0.30"
+    websocket-as-promised "^0.10.1"
+    zksync-crypto "^0.0.2"