chore(deps): bump jira-client from 6.20.0 to 6.21.0

Bumps [jira-client](https://github.com/jira-node/node-jira-client) from 6.20.0 to 6.21.0.
- [Release notes](https://github.com/jira-node/node-jira-client/releases)
- [Commits](jira-node/node-jira-client@v6.20.0...v6.21.0)

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

package.json

@@ -80,7 +80,7 @@
     "dotenv": "^8.2.0",
     "express": "^4.17.1",
     "helmet": "^4.1.1",
-    "jira-client": "^6.20.0",
+    "jira-client": "^6.21.0",
     "jira2md": "^2.0.4",
     "jsonwebtoken": "^8.5.1",
     "mime-types": "^2.1.27",