Increase recommended Rust toolchain to 1.96.0

[mulkieran]

• Fix any newly introduced compiler or clippy errors:

  • devicemapper-rs
  • libblkid-rs
  • libcryptsetup-rs
  • loopdev-3
  • stratisd

• Bump CURRENT DEVELOPMENT TOOLCHAIN in GitHub workflows:

  • devicemapper-rs
  • libblkid-rs
  • libcryptsetup-rs
  • loopdev-3
  • stratisd

[coderabbitai]

🔗 Related PRs

#824 - No longer require f41 for Rust libraries [merged]

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