EXC_BAD_ACCESS in SentryTracer cancelDeadlineTimer

[philipphofmann]

Description

The SDK crashes with EXC_BAD_ACCESS here

sentry-cocoa/Sources/Sentry/SentryTracer.m

Lines 268 to 272 in e324230

	- (void)cancelDeadlineTimer
	{
	[self.deadlineTimer invalidate];
	self.deadlineTimer = nil;
	}

The SDK crash in Sentry has more context. This is happening across multiple versions see

This is related to #3002.

[gid-sentry]

Hey team looks like we're potentially seeing this again in 8.43.0