chore: upgrade docker distribution from 2.7.1 to 2.8.0

[jawnsy]

Fixes a low-severity security vulnerability:
GHSA-qq97-vm5h-rrhg

[codecov]

Codecov Report

Merging #328 (904a3c0) into main (5bfdb0c) will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #328      +/-   ##
==========================================
+ Coverage   67.35%   67.49%   +0.13%     
==========================================
  Files         140      140              
  Lines        7407     7407              
  Branches       77       77              
==========================================
+ Hits         4989     4999      +10     
+ Misses       1906     1898       -8     
+ Partials      512      510       -2     

Flag	Coverage Δ
unittest-go-macos-latest	66.04% <ø> (+0.13%)	⬆️
unittest-go-ubuntu-latest	67.45% <ø> (+0.13%)	⬆️
unittest-go-windows-latest	65.66% <ø> (-0.10%)	⬇️
unittest-js	63.61% <ø> (ø)

Impacted Files	Coverage Δ
peerbroker/dial.go	80.95% <0.00%> (ø)
coderd/provisionerdaemons.go	57.84% <0.00%> (ø)
provisionerd/provisionerd.go	69.74% <0.00%> (+0.39%)	⬆️
peer/conn.go	77.69% <0.00%> (+1.28%)	⬆️
peerbroker/listen.go	84.80% <0.00%> (+2.39%)	⬆️

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