[deps]: Update dtolnay/rust-toolchain digest to f7ccc83

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dtolnay/rust-toolchain	action	digest	b3b07ba → f7ccc83

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[bitwarden-bot]

Internal tracking:

• ID: PM-27396
• Link: https://bitwarden.atlassian.net/browse/PM-27396

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.03%. Comparing base (ad6555c) to head (e512f5d).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6497      +/-   ##
==========================================
- Coverage   55.04%   55.03%   -0.01%     
==========================================
  Files        1934     1934              
  Lines       85581    85581              
  Branches     7656     7656              
==========================================
- Hits        47108    47102       -6     
- Misses      36685    36692       +7     
+ Partials     1788     1787       -1     

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[djsmith85]

Also approved on bitwarden/sdk-internal#630