Harmonize granularity of dependency versions?

[dirksammel]

We currently have different granularity of our dependency versions across different Cargo.toml files, but also in single files.
Some examples:
plugins/priority/Cargo.toml: serde-aux = "4"
collectors/slurm/Cargo.toml: serde-aux = "4.2.0"
collectors/slurm/Cargo.toml: anyhow = "1"

Should this be harmonized?
If we just use the major version, we have less work with dependabot PRs. But in our current workflow, we only get the minor version updates when we run cargo update before releasing a new AUDITOR version.
If we use the minor version, we get regular dependabot PRs and workflow checks during the development.