build: Update to typescript 5.8.0

[mydea]

This updates the TS version we use to 5.8.0.

We still downlevel to 3.8 so this should not be breaking (even if we were to use newer features eventually), downlevel-dts will fail/or our tests anyhow if we use some features that cannot be downlevelled.

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	9,543	-	9,012	+6%
GET With Sentry	1,408	15%	1,348	+4%
GET With Sentry (error only)	6,118	64%	5,945	+3%
POST Baseline	1,209	-	1,135	+7%
POST With Sentry	525	43%	486	+8%
POST With Sentry (error only)	1,056	87%	981	+8%
MYSQL Baseline	3,360	-	3,304	+2%
MYSQL With Sentry	499	15%	409	+22%
MYSQL With Sentry (error only)	2,725	81%	2,698	+1%

View base workflow run