fix: the equality checks for DNSPointer and DNSService should be case insensitive

[bdraco]

The name check is already using the key (lowercase value) but the server and alias did not use their respective keys

There are likely more cases where we don't handle this perfectly https://datatracker.ietf.org/doc/html/rfc4343#section-2

fixes #1121

[codecov-commenter]

Codecov Report

Base: 99.72% // Head: 99.72% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (a00710d) compared to base (3a25ff7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1122   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          22       22           
  Lines        2590     2591    +1     
  Branches      456      456           
=======================================
+ Hits         2583     2584    +1     
  Misses          5        5           
  Partials        2        2           

Impacted Files	Coverage Δ
src/zeroconf/__init__.py	100.00% <100.00%> (ø)
src/zeroconf/_dns.py	100.00% <100.00%> (ø)

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