Pin rustc in fuzzing to 1.58 due to honggfuzz-rs regression

[TheBlueMatt]

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[codecov-commenter]

Codecov Report

Merging #1335 (5da2253) into main (4b77ce1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1335   +/-   ##
=======================================
  Coverage   90.49%   90.49%           
=======================================
  Files          72       72           
  Lines       39631    39631           
=======================================
  Hits        35865    35865           
  Misses       3766     3766           

Impacted Files	Coverage Δ
lightning/src/util/events.rs	33.09% <0.00%> (-0.36%)	⬇️
lightning/src/ln/functional_tests.rs	97.05% <0.00%> (+0.01%)	⬆️

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