Client tests fail randomly due to "tinypool"

[naftis]

https://github.com/opencrvs/opencrvs-core/actions/runs/9679409583/job/26706927180?pr=7253#step:12:102

Error: Unexpected message from Worker: { taskId: 83, result: undefined, error: null }
    at WorkerInfo.onMessage (file:///home/runner/work/opencrvs-core/opencrvs-core/node_modules/tinypool/dist/esm/index.js:522:21)

Randomly the tests fail due to this tinypool error in vitest.

[naftis]

vitest-dev/vitest#4172 pool: 'forks' which might help fix this is first supported in v1.0.0
vitest-dev/vitest#3925 parallel child_process first supported in v0.34.7 helps configuring the pool: 'forks' in a different way.
vitest-dev/vitest#5047 pool: 'forks' is going to be the default in v2.0.0