Update to renamed method and argument in KERIpy

[pfeairheller]

This PR updates 3 references to a method renamed in KERIpy

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5e6c97e) 91.25% compared to head (5223ab4) 91.25%.

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #157   +/-   ##
============================================
  Coverage        91.25%   91.25%           
============================================
  Files               35       35           
  Lines             6026     6026           
============================================
  Hits              5499     5499           
  Misses             527      527           

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[psteniusubi]

Looks like i created this same pr here #160.

There's one more reference to findAnchoringEvent here

keria/src/keria/core/longrunning.py

Line 271 in 5e6c97e

if self.hby.db.findAnchoringEvent(op.oid, anchor=anchor) is not None: