chore(deps): update dtolnay/rust-toolchain digest to b725eda

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dtolnay/rust-toolchain (changelog)	action	digest	686976e → b725eda

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Code Metrics Report

	main (aee387e)	#45 (4b6b18e)	+/-
Coverage	74.2%	74.2%	0.0%
Code to Test Ratio	1:1.2	1:1.2	0.0

Details

  |                    | main (aee387e) | #45 (4b6b18e) | +/-  |
  |--------------------|----------------|---------------|------|
  | Coverage           |          74.2% |         74.2% | 0.0% |
  |   Files            |             12 |            12 |    0 |
  |   Lines            |            567 |           567 |    0 |
  |   Covered          |            421 |           421 |    0 |
  | Code to Test Ratio |          1:1.2 |         1:1.2 |  0.0 |
  |   Code             |           2010 |          2010 |    0 |
  |   Test             |           2481 |          2481 |    0 |

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Reported by octocov