Bump uvm from de434fe to b4eb98f (#671)

Bumps [uvm](https://github.com/antmicro/uvm-verilator) from `de434fe` to `b4eb98f`.
- [Commits](antmicro/uvm-verilator@de434fe...b4eb98f)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>