ci: remove cargo-nextest bug workaround #15004

Job	Run time
Build C library (ubuntu-latest)	2m 31s
cargo deny	33s
Build C library (macos-latest)	2m 27s
Rust doc comments	16s
Lint Rust	2m 10s
Check if node constants are up to date	6s
Check provider database	8s
Python lint	13s
Build deltachat-rpc-server (ubuntu-latest)	2m 13s
Build deltachat-rpc-server (macos-latest)	2m 17s
Build deltachat-rpc-server (windows-latest)	6m 28s
Rust tests (ubuntu-latest, 1.78.0)	3m 17s
Rust tests (windows-latest, 1.78.0)	8m 25s
Rust tests (macos-latest, 1.78.0)	3m 6s
Rust tests (ubuntu-latest, 1.77.0)	3m 19s
CFFI Python tests (ubuntu-latest, 3.12)	5m 34s
CFFI Python tests (macos-latest, 3.12)	5m 50s
CFFI Python tests (ubuntu-latest, pypy3.10)	6m 23s
CFFI Python tests (macos-latest, pypy3.10)	5m 30s
CFFI Python tests (ubuntu-latest, 3.7)	5m 41s
JSON-RPC Python tests (ubuntu-latest, 3.12)	3m 27s
JSON-RPC Python tests (macos-latest, 3.12)	3m 42s
JSON-RPC Python tests (windows-latest, 3.12)	4m 1s
JSON-RPC Python tests (ubuntu-latest, pypy3.10)	3m 51s
JSON-RPC Python tests (macos-latest, pypy3.10)	3m 50s
JSON-RPC Python tests (ubuntu-latest, 3.7)	4m 34s
	1h 29m 52s

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