Chore: Fix CVE-2021-3918

[jackw]

What this PR does / why we need it:
This PR aims to fix a critical vulnerability reported in json-schema which appears to be a nested dependency of blink-diff used by the snapshot testing feature of @grafana/e2e.

yarn why json-schema -R
├─ @grafana/e2e@workspace:packages/grafana-e2e
│  ├─ blink-diff@npm:1.0.13 (via npm:1.0.13)
│  │  └─ pngjs-image@npm:0.11.7 (via npm:~0.11.5)
│  │     └─ request@npm:2.88.2 (via npm:^2.55.0)
│  │        └─ http-signature@npm:1.2.0 (via npm:~1.2.0)
│  │           └─ jsprim@npm:1.4.1 (via npm:^1.2.2)
│  │              └─ json-schema@npm:0.2.3 (via npm:0.2.3)
│  └─ cypress@npm:9.5.1 (via npm:9.5.1)
│     └─ @cypress/request@npm:2.88.10 (via npm:^2.88.10)
│        └─ http-signature@npm:1.3.6 (via npm:~1.3.6)
│           └─ jsprim@npm:2.0.2 (via npm:^2.0.2)
│              └─ json-schema@npm:0.4.0 (via npm:0.4.0)
│
└─ grafana@workspace:.
   ├─ @grafana/e2e@workspace:packages/grafana-e2e (via workspace:*)

Forced resolution by running yarn set resolution json-schema@npm:0.2.3 0.4.0