fix: use protected Date header when available #18502

Job	Run time
cargo deny	28s
Lint Rust	2m 35s
Build C library (ubuntu-latest)	2m 35s
Rust doc comments	14s
Check provider database	4s
Build C library (macos-latest)	2m 14s
Rust tests (ubuntu-latest, 1.84.1)	2m 59s
Python lint	13s
Rust tests (windows-latest, 1.84.1)	8m 6s
Build deltachat-rpc-server (ubuntu-latest)	2m 3s
Rust tests (macos-latest, 1.84.1)	3m 13s
Build deltachat-rpc-server (macos-latest)	2m 39s
Rust tests (ubuntu-latest, 1.81.0)	3m 1s
Build deltachat-rpc-server (windows-latest)	5m 47s
CFFI Python tests (ubuntu-latest, 3.13)	5m 54s
CFFI Python tests (macos-latest, 3.13)	3m 52s
CFFI Python tests (ubuntu-latest, pypy3.10)	6m 2s
CFFI Python tests (macos-latest, pypy3.10)	5m 44s
CFFI Python tests (ubuntu-latest, 3.8)	5m 0s
JSON-RPC Python tests (ubuntu-latest, 3.13)	2m 14s
JSON-RPC Python tests (macos-latest, 3.13)	2m 1s
JSON-RPC Python tests (windows-latest, 3.13)	3m 0s
JSON-RPC Python tests (ubuntu-latest, pypy3.10)	2m 55s
JSON-RPC Python tests (macos-latest, pypy3.10)	2m 36s
JSON-RPC Python tests (ubuntu-latest, 3.8)	2m 6s
	1h 17m 35s

Provide feedback