testing/firecracker: upgrade to 1.1.1

https://github.com/firecracker-microvm/firecracker/releases/tag/v1.1.1

v1.1.0...v1.1.1

Added

• Add a new CPU template called T2S. This exposes the same CPUID as T2 to the Guest and also overwrites the ARCH_CAPABILITIES MSR to expose a reduced set of capabilities. With regards to hardware vulnerabilities and mitigations, the Guest vCPU will apear to look like a Skylake CPU, making it safe to snapshot uVMs running on a newer host CPU (Cascade Lake) and restore on a host that has a Skylake CPU.

Fixed

• Make the T2 template more robust by explicitly disabling additional CPUID flags that should be off but were missed initially or that were not available in the spec when the template was created.