Use previous version commit for webb-proposals

[salman01zp]

Summary of changes
Changes introduced in this pull request:

• update webb-proposals to previous version commit
  tangle-network/webb-rs@a960eaf

Reference issue to close (if applicable)

Closes

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (16716c0) 17.01% compared to head (deec16c) 17.01%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #701   +/-   ##
=======================================
  Coverage   17.01%   17.01%           
=======================================
  Files          77       77           
  Lines        5617     5617           
=======================================
  Hits          955      955           
  Misses       4662     4662           

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