chore: Remove master branch references

[philipphofmann]

Remove remaining master branch references, or replace them with main.

#skip-changelog

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1199.86 ms	1216.56 ms	16.70 ms
Size	20.76 KiB	414.45 KiB	393.69 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
443723a	1205.24 ms	1220.52 ms	15.28 ms
7c5d161	1224.38 ms	1249.66 ms	25.28 ms
56ec5d0	1236.65 ms	1261.90 ms	25.25 ms
56ec5d0	1194.39 ms	1236.94 ms	42.55 ms
feba2be	1246.67 ms	1254.64 ms	7.97 ms

App size

Revision	Plain	With Sentry	Diff
443723a	20.76 KiB	414.44 KiB	393.68 KiB
7c5d161	20.76 KiB	414.44 KiB	393.68 KiB
56ec5d0	20.76 KiB	414.44 KiB	393.69 KiB
56ec5d0	20.76 KiB	414.44 KiB	393.68 KiB
feba2be	20.76 KiB	414.45 KiB	393.69 KiB

[codecov]

Codecov Report

Merging #2618 (c232067) into main (56ec5d0) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2618      +/-   ##
==========================================
+ Coverage   79.82%   79.84%   +0.02%     
==========================================
  Files         243      243              
  Lines       22614    22629      +15     
  Branches    10010    10016       +6     
==========================================
+ Hits        18051    18068      +17     
- Misses       4112     4113       +1     
+ Partials      451      448       -3     

Impacted Files	Coverage Δ
Sources/Sentry/include/SentryMachLogging.hpp	58.82% <0.00%> (-17.65%)	⬇️
Sources/Sentry/NSLocale+Sentry.m	90.00% <0.00%> (-10.00%)	⬇️
Sources/Sentry/SentryMachLogging.cpp	0.00% <0.00%> (-3.02%)	⬇️
Sources/Sentry/SentryFileManager.m	95.04% <0.00%> (-0.42%)	⬇️
Sources/Sentry/SentryProfilingLogging.mm	51.85% <0.00%> (ø)
Sources/Sentry/include/SentryProfilingLogging.hpp	54.54% <0.00%> (ø)
Sources/Sentry/SentryNetworkTracker.m	95.43% <0.00%> (+0.23%)	⬆️
Sources/Sentry/SentryBacktrace.cpp	90.17% <0.00%> (+1.78%)	⬆️
Sources/Sentry/SentryThreadHandle.cpp	72.67% <0.00%> (+3.27%)	⬆️
Sources/Sentry/SentryThreadMetadataCache.cpp	95.65% <0.00%> (+4.34%)	⬆️
... and 1 more

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