test(IDX): increase timeout to 15m for the ledger_canister_test #21314

Job	Run time
Bazel Build Fuzzers	4m 12s
Bazel Test All	15m 23s
Bazel Build All Config Check	0s
Bazel Build Fuzzers AFL	4m 19s
Bazel Test macOS Intel	0s
Build IC	16m 26s
Python CI Tests	1m 42s
Cargo Build Release Linux	8s
Cargo Clippy Linux	16s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	15s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	14s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	15s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	23s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	19s
	43m 52s

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