fix: android build error when compiling

[buenaflor]

📜 Description

Remove kotlin.time usage and use raw value instead, and revertuppercase to toUpperCase

💡 Motivation and Context

Fixes #2396

🔮 Next steps

Figure out why our CI didn't catch this

[github-actions]

🚨 Detected changes in high risk code 🚨

High-risk code has higher potential to break the SDK and may be hard to test. To prevent severe bugs, apply the rollout process for releasing such changes and be extra careful when changing and reviewing these files:

• flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.84%. Comparing base (393dde2) to head (ff05f12).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2397      +/-   ##
==========================================
+ Coverage   84.72%   84.84%   +0.11%     
==========================================
  Files         254       79     -175     
  Lines        9113     2804    -6309     
==========================================
- Hits         7721     2379    -5342     
+ Misses       1392      425     -967     

☔ View full report in Codecov by Sentry.
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[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	491.73 ms	542.32 ms	50.59 ms
Size	6.49 MiB	7.57 MiB	1.08 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
e5b744f	302.70 ms	342.17 ms	39.47 ms
0ac1eed	370.60 ms	441.54 ms	70.94 ms
90a08ea	477.25 ms	534.10 ms	56.85 ms
0db91cc	327.85 ms	387.31 ms	59.46 ms
061fed2	434.11 ms	506.49 ms	72.38 ms
4829ad3	381.55 ms	455.45 ms	73.90 ms
519423f	357.00 ms	415.77 ms	58.77 ms
ddc97ad	331.45 ms	384.06 ms	52.61 ms
e3ef570	389.71 ms	459.16 ms	69.45 ms
2d3b03d	309.53 ms	353.40 ms	43.87 ms

App size

Revision	Plain	With Sentry	Diff
e5b744f	6.06 MiB	7.09 MiB	1.03 MiB
0ac1eed	6.06 MiB	7.03 MiB	990.44 KiB
90a08ea	6.49 MiB	7.55 MiB	1.06 MiB
0db91cc	5.94 MiB	6.95 MiB	1.01 MiB
061fed2	6.52 MiB	7.59 MiB	1.06 MiB
4829ad3	6.33 MiB	7.26 MiB	943.11 KiB
519423f	6.06 MiB	7.03 MiB	989.24 KiB
ddc97ad	6.16 MiB	7.14 MiB	1003.75 KiB
e3ef570	6.33 MiB	7.26 MiB	950.38 KiB
2d3b03d	6.06 MiB	7.09 MiB	1.03 MiB