Nuget dependencies should be managed with a lockfile

## 🧹 Tech Debt

The current package references in nimble are managed with semantic version ranges but there is no lockfile used in nimble to lock dependencies to a specific version.

We should use a lockfile in the repo so our dependencies to make sure nimble builds are reproducible across local and CI.

See discussion in: https://github.com/ni/nimble/pull/1697#discussion_r1412362903