Increase recommended Rust toolchain to 1.79.0

[mulkieran]

• [x] Fix any newly introduced compiler or clippy errors (CLIPPY_FIX=1 make clippy and refine procedure for automatically applying clippy changes):

  • [x] devicemapper-rs: https://github.com/stratis-storage/devicemapper-rs/pull/921
  • [x] libblkid-rs
  • [x] libcryptsetup-rs
  • [x] loopdev-3
  • [x] stratisd: https://github.com/stratis-storage/stratisd/pull/3629

• [x] Give karma for f40 Rust release: https://bodhi.fedoraproject.org/updates/FEDORA-2024-2cada8f6eb

• [x] Bump current development toolchain in GitHub workflows

  • [x] devicemapper-rs
  • [x] libblkid-rs
  • [x] libcryptsetup-rs
  • [x] loopdev-3
  • [x] stratisd
  • [x] stratis-cli

[bgurney-rh]

No clippy errors were found for loopdev-3, libcryptsetup-rs, or libblkid-rs.