Revert "chore(deps): Upgrade tokio-rustls to 0.26 (#3419)"

[sfleen]

This reverts commit bb6e9b7.

This has been causing CI failures, reverting this change until those can be figured out.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.75%. Comparing base (96124bc) to head (be550c8).
Report is 738 commits behind head on main.

Files with missing lines	Patch %	Lines
linkerd/meshtls/rustls/src/creds/store.rs	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3553      +/-   ##
==========================================
- Coverage   67.68%   66.75%   -0.93%     
==========================================
  Files         332      388      +56     
  Lines       15158    18135    +2977     
==========================================
+ Hits        10259    12106    +1847     
- Misses       4899     6029    +1130     

Files with missing lines	Coverage Δ
linkerd/app/outbound/src/tls/logical/tests.rs	95.83% <100.00%> (ø)
linkerd/meshtls/rustls/src/client.rs	63.26% <100.00%> (ø)
linkerd/meshtls/rustls/src/creds.rs	81.08% <100.00%> (ø)
linkerd/meshtls/rustls/src/creds/receiver.rs	54.54% <ø> (ø)
linkerd/meshtls/rustls/src/creds/verify.rs	87.50% <100.00%> (ø)
linkerd/meshtls/rustls/src/server.rs	80.30% <100.00%> (ø)
linkerd/meshtls/rustls/src/creds/store.rs	90.90% <91.66%> (-1.52%)	⬇️

... and 167 files with indirect coverage changes

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