build(deps): bump immutable from 4.3.4 to 4.3.8 - #494

Process completed with exit code 1.

1) [firefox] › tests/embeds.spec.js:118:5 › csp blocking in place ──────────────────────────────── Error: expect(received).toBe(expected) // Object.is equality Expected: 5 Received: 4 175 | 176 | case "firefox": > 177 | expect(didNotFetch).toBe(5); | ^ 178 | break; 179 | 180 | case "webkit": at /home/runner/work/replayweb.page/replayweb.page/tests/embeds.spec.js:177:27