build(deps): bump @slack/webhook from 5.0.4 to 6.0.0 (#12974)

Bumps [@slack/webhook](https://github.com/slackapi/node-slack-sdk) from 5.0.4 to 6.0.0.
- [Release notes](https://github.com/slackapi/node-slack-sdk/releases)
- [Commits](https://github.com/slackapi/node-slack-sdk/compare/@slack/webhook@5.0.4...@slack/webhook@6.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package-lock.json

@@ -1606,12 +1606,12 @@
       "integrity": "sha512-tA7GG7Tj479vojfV3AoxbckalA48aK6giGjNtgH6ihpLwTyHE3fIgRrvt8TWfLwW8X8dyu7vgmAsGLRG7hWWOg=="
     },
     "@slack/webhook": {
-      "version": "5.0.4",
-      "resolved": "https://registry.npmjs.org/@slack/webhook/-/webhook-5.0.4.tgz",
-      "integrity": "sha512-IC1dpVSc2F/pmwCxOb0QzH2xnGKmyT7MofPGhNkeaoiMrLMU+Oc7xV/AxGnz40mURtCtaDchZSM3tDo9c9x6BA==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@slack/webhook/-/webhook-6.0.0.tgz",
+      "integrity": "sha512-2fohfhLI9lkAmOSWt1R457JBsB3iFNqahu4GqdFZRtcp/bT+xeG/kPn/hQa78JS74poRjWTt5G/qJjNaWMGOEQ==",
       "requires": {
         "@slack/types": "^1.2.1",
-        "@types/node": ">=8.9.0",
+        "@types/node": ">=12.0.0",
         "axios": "^0.21.1"
       }
     },

package.json

@@ -9,7 +9,7 @@
     "@babel/register": "^7.13.16",
     "@google-cloud/trace-agent": "^5.1.3",
     "@parse/node-apn": "^4.1.1",
-    "@slack/webhook": "^5.0.4",
+    "@slack/webhook": "^6.0.0",
     "accepts": "^1.3.5",
     "amazon-payments": "^0.2.8",
     "amplitude": "^5.1.5",