Bump vega from 5.23.0 to 5.31.0 in /src/ui

Bumps [vega](https://github.com/vega/vega) from 5.23.0 to 5.31.0.
- [Release notes](https://github.com/vega/vega/releases)
- [Commits](vega/vega@v5.23.0...v5.31.0)

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

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

Author: dependabot[bot]

src/ui/package.json

@@ -134,7 +134,7 @@
     "typeface-roboto-mono": "^0.0.75",
     "typeface-walter-turncoat": "^1.1.13",
     "universal-cookie": "^4.0.4",
-    "vega": "5.23.0",
+    "vega": "5.31.0",
     "vega-embed": "^6.15.0",
     "vega-lite": "5.6.1",
     "vega-scale": "^7.0.0",