Merge #123: Fix rustfmt deprecation warning by replacing version with style_edition

cdc9d0d chore: replaced deprecated 'version' option with 'style_edition' and update nightly version to 2025-04-04 (GideonBature)

Pull request description:

  This PR addresses the deprecation warning from `rustfmt` related to the use of the `version` configuration option in the `rustfmt.toml` file. Replaced the `version` key in favor of the `style_edition` key, as suggested by the warning.

  ### Changes Made

  - Removed `version = "One"` from `rustfmt.toml`
  - Added `style_edition = "2021"` to match the crates' Rust edition and the `edition` in the `rustfmt.toml` file.

  Closes #121

ACKs for top commit:
  tcharding:
    ACK cdc9d0d

Tree-SHA512: 5f5ccfbd56d80cc1120f328b1960a5508b9800802abbeb65ee90851d01822f77103046de3d60d2a066d245648cca4be31216e076273f7ff04ca364150d542ad0

Author: tcharding

nightly-version

@@ -1 +1 @@
-nightly-2024-09-01
+nightly-2025-04-04

rustfmt.toml

@@ -58,7 +58,7 @@ match_block_trailing_comma = false
 blank_lines_upper_bound = 1
 blank_lines_lower_bound = 0
 edition = "2021"
-version = "One"
+style_edition = "2021"
 inline_attribute_width = 0
 format_generated_files = true
 merge_derives = true