fix(ckbtc): Drop Host header from https outcall request #21323

Job	Run time
Bazel Test All	3m 41s
Bazel Test macOS Intel	0s
Bazel Build All Config Check	0s
Bazel Build Fuzzers	2m 23s
Bazel Build Fuzzers AFL	4m 10s
Build IC	5m 33s
Python CI Tests	1m 47s
Cargo Build Release Linux	7m 36s
Cargo Clippy Linux	4m 5s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	14s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	24s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	14s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	17s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	17s
	30m 41s

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