workaround fix for prometheus endpoint

[LesnyRumcajs]

Summary of changes
Changes introduced in this pull request:

• Workaround for (regression) Forest metrics are no longer available #1513
• Created an issue to provide a "real" solution: Update Prometheus crate #1515

Reference issue to close (if applicable)

Closes #1513

Other information and links

[codecov]

Codecov Report

Merging #1516 (41b7abe) into main (e2accbe) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1516      +/-   ##
==========================================
- Coverage   44.32%   44.32%   -0.01%     
==========================================
  Files         315      315              
  Lines       28173    28173              
==========================================
- Hits        12489    12487       -2     
- Misses      15684    15686       +2     

Impacted Files	Coverage Δ
blockchain/message_pool/src/msg_chain.rs	80.24% <0.00%> (-0.41%)	⬇️
vm/actor/src/builtin/miner/mod.rs	33.49% <0.00%> (-0.05%)	⬇️

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