allow root to call update_shard_config #650

Job	Run time
cargo-toml-fmt	10s
Cancel Previous Runs	4s
Rust check cargo build --release	5m 16s
license-check	3m 46s
Rust check cargo build --release --features dot	5m 21s
Rust check cargo build --release --features ksm	5m 9s
Rust check cargo test --all --features runtime-benchmarks	5m 26s
Rust check cargo test --all --features dot	4m 47s
Rust check cargo test --all --features ksm	4m 55s
Rust check cargo fmt --all -- --check	1m 49s
Rust check cargo clippy -- -D warnings	3m 54s
	40m 37s

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