Bump username from 5.1.0 to 7.0.0

Bumps [username](https://github.com/sindresorhus/username) from 5.1.0 to 7.0.0.
- [Release notes](https://github.com/sindresorhus/username/releases)
- [Commits](sindresorhus/username@v5.1.0...v7.0.0)

---
updated-dependencies:
- dependency-name: username
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -243,7 +243,7 @@
         "portfinder": "^1.0.28",
         "telaug": "0.0.13",
         "tmp": "^0.2.1",
-        "username": "^5.1.0",
+        "username": "^7.0.0",
         "vscode-kubernetes-tools-api": "^1.3.0",
         "vscode-tas-client": "^0.1.75",
         "watchpack": "^2.3.1"