Increase VM tests timeout to 10s
Increase VM tests timeout to 10s

... from 5s, for slow test `CallToNameRegistratorTooMuchMemory1` that
locally seems to take 9s.

This test was already slow in master - 3.5s on 4ea10e5 as per excerpt
from [CI](https://circleci.com/gh/aeternity/epoch/40007) ...
```
Top 10 slowest tests (3.838 seconds, 63.3% of total time):
  aevm_test_utils:testcase/2: VMTests/vmSystemOperations/CallToNameRegistratorTooMuchMemory1
    3.579 seconds
  aevm_test_utils:testcase/2: VMTests/vmPerformance/fibonacci16
    0.088 seconds
  aevm_test_utils:testcase/2: VMTests/vmArithmeticTest/add0
    0.030 seconds
...
```
... though moving VM gas constants to governance made test slower.

aeternity/epoch,aeternity/epoch,aeternity/epoch,aeternity/epoch