ci: update from xcode 16.2 to 16.4

[armcknight]

I encountered an error on a check run:

xcodebuild: error: Unable to find a device matching the provided destination specifier

and thought maybe this is why. generally we should be on the latest version anyways. ideally we could centralize this in something like //.xcode-version which we could cat out into CI steps, but i'll tackle that separately.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.179%. Comparing base (035974f) to head (cf0727f).
Report is 10 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #5556       +/-   ##
=============================================
- Coverage   86.199%   86.179%   -0.021%     
=============================================
  Files          407       406        -1     
  Lines        35072     34948      -124     
  Branches     15228     16448     +1220     
=============================================
- Hits         30232     30118      -114     
+ Misses        4793      4546      -247     
- Partials        47       284      +237     

see 52 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 035974f...cf0727f. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1229.76 ms	1242.16 ms	12.41 ms
Size	23.74 KiB	874.07 KiB	850.32 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
b0e13a7	1227.71 ms	1245.88 ms	18.16 ms
018037b	1209.31 ms	1228.33 ms	19.03 ms
61414e8	1225.49 ms	1254.28 ms	28.79 ms
f92cfa9	1217.94 ms	1240.06 ms	22.12 ms
63ac649	1192.10 ms	1216.78 ms	24.68 ms
9be5373	1215.92 ms	1239.44 ms	23.52 ms
2609f7a	1218.17 ms	1241.34 ms	23.17 ms
db9572a	1200.27 ms	1234.80 ms	34.53 ms
f92cfa9	1228.45 ms	1251.33 ms	22.88 ms
fc0757d	1231.83 ms	1248.98 ms	17.15 ms

App size

Revision	Plain	With Sentry	Diff
b0e13a7	23.75 KiB	860.98 KiB	837.23 KiB
018037b	23.75 KiB	867.16 KiB	843.41 KiB
61414e8	23.75 KiB	867.69 KiB	843.94 KiB
f92cfa9	23.75 KiB	855.38 KiB	831.63 KiB
63ac649	23.75 KiB	855.38 KiB	831.63 KiB
9be5373	23.75 KiB	866.50 KiB	842.75 KiB
2609f7a	23.75 KiB	867.04 KiB	843.29 KiB
db9572a	23.75 KiB	858.69 KiB	834.93 KiB
f92cfa9	23.75 KiB	855.38 KiB	831.62 KiB
fc0757d	23.75 KiB	850.73 KiB	826.98 KiB

[armcknight]

I tried a few things in #5562 to attempt to fix the pod lint errors, but haven't had success yet.