Removed unnecessary dependencies

packages/slack/package.json

@@ -15,7 +15,6 @@
     "test:lint:fix": "eslint src --ext .ts --fix"
   },
   "dependencies": {
-    "@babel/helper-validator-identifier": "^7.14.5",
     "axios": "^0.21.1",
     "browser-bunyan": "^1.6.3",
     "bunyan": "^1.8.15",

yarn.lock

@@ -569,11 +569,6 @@
   dependencies:
     "@babel/types" "^7.8.3"
 
-"@babel/helper-validator-identifier@^7.14.5":
-  version "7.14.5"
-  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.5.tgz#d0f0e277c512e0c938277faa85a3968c9a44c0e8"
-  integrity sha512-5lsetuxCLilmVGyiLEfoHBRX8UCFD+1m2x3Rj97WrW3V7H3u4RWRXA4evMjImCsin2J2YT0QaVDGf+z8ondbAg==
-
 "@babel/helper-wrap-function@^7.1.0":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.2.0.tgz#c4e0012445769e2815b55296ead43a958549f6fa"