Update MSRV to 1.71 and add CI test

[dani-garcia]

Type of change

- [ ] Bug fix
- [ ] New feature development
- [x] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

Update MSRV in Cargo.toml and Readme to be up to date with the dependencies that we're using, plus add a test to check that we don't deviate from it.

The dependency causing the bump is env_logger with a MSRV of 1.71 (released July 2023) https://github.com/rust-cli/env_logger/blob/9303b0c0393c33046a791b0a6497b0f03ef1f434/Cargo.toml#L8

The issue seems to also be affecting other crates in the workspace that don't depend on that crate because the MSRV bump is due to some cargo changes regarding dep: features and so it seems to affect the version resolution of the entire workspace.

Note that this required a small change to exporters, apparently older rust versions have trouble disambiguating the csv crate with the csv module.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2290bc8) 59.44% compared to head (79c689d) 59.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #589   +/-   ##
=======================================
  Coverage   59.44%   59.44%           
=======================================
  Files         171      171           
  Lines       10324    10324           
=======================================
  Hits         6137     6137           
  Misses       4187     4187           

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[bitwarden-bot]

Checkmarx One – Scan Summary & Details – 1818f498-9b54-40a2-aab4-b8fc0fce2316

No New Or Fixed Issues Found