build(deps): bump vega in /tfjs-data/demo/boston-housing (#7444)

Bumps [vega](https://github.com/vega/vega) from 5.22.0 to 5.23.0.
- [Release notes](https://github.com/vega/vega/releases)
- [Commits](vega/vega@v5.22.0...v5.23.0)

---
updated-dependencies:
- dependency-name: vega
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tfjs-data/demo/boston-housing/package.json

@@ -12,7 +12,7 @@
     "@tensorflow/tfjs": "0.14.0",
     "vega-embed": "^6.20.8",
     "vega-lite": "5.2.0",
-    "vega": "5.22.0"
+    "vega": "5.23.0"
   },
   "scripts": {
     "link-local": "yalc link",