build(deps): bump third_party/litex_vexriscv_smp
build(deps): bump third_party/litex_vexriscv_smp

Bumps [third_party/litex_vexriscv_smp](https://github.com/enjoy-digital/litex_vexriscv_smp) from `cc5975c` to `f766240`.
- [Release notes](https://github.com/enjoy-digital/litex_vexriscv_smp/releases)
- [Commits](https://github.com/enjoy-digital/litex_vexriscv_smp/compare/cc5975c754c46ab6e9b0e950240d2f336beafbc6...f766240a4063d2f574b4e62aae99dac64a5c8bbc)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
SymbiFlow/fpga-tool-perf,SymbiFlow/fpga-tool-perf,SymbiFlow/fpga-tool-perf,SymbiFlow/fpga-tool-perf