Makefile: lock tuftool install

[etungsten]

Issue number:
N/A

Description of changes:
When we install tuftool, this locks the dependencies to the versions at
the time of tuftool's publication so random dependency changes won't
break our builds.

Testing done:
Can still build tuftool with an older rustc version that doesn't have edition 2021 features.

[ec2-user@ip-172-31-32-162 bottlerocket]$ cargo make tuftool
[cargo-make] INFO - cargo make 0.35.1
[cargo-make] INFO - Build File: Makefile.toml
[cargo-make] INFO - Task: tuftool
[cargo-make] INFO - Profile: development
[cargo-make] INFO - Running Task: tuftool
[cargo-make] INFO - Build Done in 230.38 seconds.
[ec2-user@ip-172-31-32-162 bottlerocket]$ rustc --version
rustc 1.51.0 (2fd73fabe 2021-03-23)

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.