fix(undici): cope with undici@6.11.0 bug that removed req.addHeader #3963
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undici TAV tests started failing recently: https://github.com/elastic/apm-agent-nodejs/actions/runs/8606452765
The issue is a bug in undici@6.11.0 that removed an API used by our instrumentation.
That bug was discussed here: nodejs/undici#3043
And it was fixed in undici@6.11.1 shortly after.