Bump bootstrap from 4.6.0 to 4.6.1 in /example

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 4.6.0 to 4.6.1.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v4.6.0...v4.6.1)

---
updated-dependencies:
- dependency-name: bootstrap
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

example/package-lock.json

@@ -18,7 +18,7 @@
     "@ginkgo-bioworks/react-json-schema-form-builder": "file:..",
     "@rjsf/bootstrap-4": "^3.0.0",
     "@rjsf/core": "^2.4.1",
-    "bootstrap": "^4.6.0",
+    "bootstrap": "^4.6.1",
     "react": "file:../node_modules/react",
     "react-bootstrap": "^1.6.4",
     "react-dom": "file:../node_modules/react-dom",