Allow cargo generate version 0.22

[DOBEN]

Purpose

Fixes #442

Changes

• Allow cargo-generate 0.22. The changes from 0.21.*/0.22.0 are not important https://github.com/cargo-generate/cargo-generate/releases/tag/v0.22.0.
  https://github.com/cargo-generate/cargo-generate/releases.
• Fix some remaining tests/naming that were not updated after the rewrite of the default template Simplify voting #441.

[Victor-N-Suadicani]

Just one comment on the version. Also the concordium-std/src/lib.rs files seems to trigger some lints.

[DOBEN]

We discussed that the lint warnings in concordium-std/src/lib.rs (which have been there for a long time) are not related to this PR and can be addressed in another PR.