Fix Web Example build due to min. Dart version

[marandaneto]

📜 Description

Fix Web Example build due to min. Dart version
#skip-changelog

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[krystofwoldrich]

LGTM 🚀

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.71 🎉

Comparison is base (69670c9) 90.03% compared to head (091cee0) 90.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1299      +/-   ##
==========================================
+ Coverage   90.03%   90.75%   +0.71%     
==========================================
  Files         110      144      +34     
  Lines        3483     4736    +1253     
==========================================
+ Hits         3136     4298    +1162     
- Misses        347      438      +91     

Impacted Files	Coverage Δ
flutter/lib/src/sentry_asset_bundle.dart	94.91% <0.00%> (ø)
...t_processor/flutter_exception_event_processor.dart	100.00% <0.00%> (ø)
...src/integrations/native_app_start_integration.dart	77.77% <0.00%> (ø)
flutter/lib/src/sentry_native_channel.dart	80.35% <0.00%> (ø)
...r/lib/src/integrations/native_sdk_integration.dart	100.00% <0.00%> (ø)
...ib/src/integrations/flutter_error_integration.dart	100.00% <0.00%> (ø)
flutter/lib/src/renderer/renderer.dart	62.50% <0.00%> (ø)
flutter/lib/src/file_system_transport.dart	100.00% <0.00%> (ø)
...ter/lib/src/integrations/on_error_integration.dart	93.93% <0.00%> (ø)
.../src/integrations/load_image_list_integration.dart	96.00% <0.00%> (ø)
... and 24 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	335.92 ms	395.78 ms	59.86 ms
Size	6.06 MiB	7.09 MiB	1.03 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
8fa3934	340.64 ms	407.92 ms	67.28 ms
fbf42af	323.04 ms	365.09 ms	42.04 ms
21d4150	379.31 ms	449.23 ms	69.93 ms
08a7b4f	346.47 ms	403.29 ms	56.82 ms
9811573	309.76 ms	402.60 ms	92.84 ms
c70e01a	331.04 ms	401.46 ms	70.42 ms
48e79fd	354.22 ms	391.46 ms	37.24 ms
3637a22	322.59 ms	390.00 ms	67.41 ms
4efee31	308.92 ms	368.68 ms	59.76 ms
6d7a391	331.94 ms	367.04 ms	35.10 ms

App size

Revision	Plain	With Sentry	Diff
8fa3934	6.06 MiB	7.09 MiB	1.03 MiB
fbf42af	5.94 MiB	6.96 MiB	1.02 MiB
21d4150	5.94 MiB	6.97 MiB	1.03 MiB
08a7b4f	5.94 MiB	6.95 MiB	1.01 MiB
9811573	5.94 MiB	6.96 MiB	1.02 MiB
c70e01a	5.94 MiB	6.97 MiB	1.03 MiB
48e79fd	5.94 MiB	6.95 MiB	1.01 MiB
3637a22	6.06 MiB	7.09 MiB	1.03 MiB
4efee31	5.94 MiB	6.92 MiB	1003.76 KiB
6d7a391	5.94 MiB	6.95 MiB	1.01 MiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1265.24 ms	1283.00 ms	17.76 ms
Size	8.10 MiB	9.08 MiB	1004.36 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
6e083bb	1244.33 ms	1264.60 ms	20.26 ms
deaeece	1252.82 ms	1279.04 ms	26.22 ms
c70e01a	1273.00 ms	1299.12 ms	26.12 ms
2d3b03d	1258.19 ms	1272.69 ms	14.50 ms
1edf30e	1254.43 ms	1272.82 ms	18.39 ms
7f2b01d	1253.92 ms	1266.70 ms	12.78 ms
3a69405	1292.84 ms	1303.96 ms	11.12 ms
ef2f368	1259.12 ms	1277.04 ms	17.92 ms
e5b744f	1250.82 ms	1284.46 ms	33.64 ms
5112c69	1272.76 ms	1293.37 ms	20.61 ms

App size

Revision	Plain	With Sentry	Diff
6e083bb	8.16 MiB	9.17 MiB	1.01 MiB
deaeece	8.16 MiB	9.17 MiB	1.01 MiB
c70e01a	8.16 MiB	9.17 MiB	1.01 MiB
2d3b03d	8.10 MiB	9.07 MiB	1000.83 KiB
1edf30e	8.16 MiB	9.17 MiB	1.01 MiB
7f2b01d	8.16 MiB	9.16 MiB	1.00 MiB
3a69405	8.15 MiB	9.15 MiB	1018.56 KiB
ef2f368	8.15 MiB	9.10 MiB	965.24 KiB
e5b744f	8.09 MiB	9.07 MiB	1001.19 KiB
5112c69	8.16 MiB	9.17 MiB	1.01 MiB