Update some dependencies to prune duplicated crates with different version (#12560)

* sc-client-babe/sp-arithmetic-fuzzer: update num-bigint and num-rational to v0.4

* update lru 0.7.5 ==> v0.8.1

* pallet-example-offchain-worker: update lite-json v0.1.3 ==> v0.2.0

* update hyper 0.14.16 ==> 0.14.20, num-fromat 0.4.0 ==> 0.4.3

* pallet-mmr: update ckb-merkle-mountain-range v0.3.2 ==> v0.5.2

* update handlebars v4.2.2 ==> v4.3.5

* `runtime_cache_size` must always be at least 1

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* default cache size with .min(1)

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* update hyper 0.14.20 ==> 0.14.22

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* update lru 0.8.0 ==> 0.8.1

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Apply suggestions from code review

* Apply suggestions from code review

* Fix Cargo.lock

Signed-off-by: koushiro <koushiro.cqx@gmail.com>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Bastian Köcher <info@kchr.de>