Replace last usages of old locker code

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #600 (c00eee5) into main (a143513) will decrease coverage by 0.04%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main     #600      +/-   ##
==========================================
- Coverage   61.77%   61.72%   -0.05%     
==========================================
  Files         127      126       -1     
  Lines        8952     8923      -29     
==========================================
- Hits         5530     5508      -22     
+ Misses       2555     2552       -3     
+ Partials      867      863       -4     

Impacted Files	Coverage Δ
core/models/contacts.go	64.23% <0.00%> (-0.12%)	⬇️
core/runner/runner.go	48.62% <100.00%> (+0.54%)	⬆️
core/tasks/handler/worker.go	48.80% <100.00%> (ø)

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