dns: don't send unsupported "priority" field for list operations

[jacobbednarz]

Noticed at a7b8640#r95124059 but isn't actually used by the API.

[github-actions]

changelog detected ✅

[codecov-commenter]

Codecov Report

Merging #1167 (db0830c) into master (6153c1e) will decrease coverage by 0.12%.
The diff coverage is 46.94%.

@@            Coverage Diff             @@
##           master    #1167      +/-   ##
==========================================
- Coverage   49.40%   49.28%   -0.13%     
==========================================
  Files         127      128       +1     
  Lines       12290    12416     +126     
==========================================
+ Hits         6072     6119      +47     
- Misses       4840     4896      +56     
- Partials     1378     1401      +23     

Impacted Files	Coverage Δ
access_organization.go	64.70% <ø> (ø)
cloudflare_experimental.go	0.00% <0.00%> (ø)
utils.go	72.72% <ø> (ø)
cloudflare.go	68.37% <14.28%> (-0.34%)	⬇️
mtls_certificates.go	26.59% <26.59%> (ø)
origin_ca.go	57.26% <90.90%> (-2.09%)	⬇️
dns.go	68.69% <92.45%> (+4.97%)	⬆️
email_routing_destination.go	66.66% <100.00%> (+0.41%)	⬆️
email_routing_rules.go	65.64% <100.00%> (+0.26%)	⬆️
filter.go	43.38% <100.00%> (+0.41%)	⬆️
... and 6 more

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[github-actions]

This functionality has been released in v0.59.0.

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