chore(deps): update polkadot-js and remove unnecessary dep bloat

[TarikGul]

Updates the following:

// Deps
"@polkadot/api": "^10.2.1",
"@polkadot/keyring": "^11.1.2",
// Dev deps
"@polkadot/util-crypto": "^11.1.2",
"@types/node-fetch": "^2.6.2",

Removes the following:

"@acala-network/type-definitions": "^0.7.4-1",

[Imod7]

LGTM!
Tiny notes :

1. @types/node-fetch has already a new version 2.6.3.
2. We no longer update lerna dependency since we do not use in the release right ? Maybe we should update the README section also ?
3. Just confirming that other packages that have new versions like ts-jest, ts-node, tsconfig-paths, typedoc, typescript, etc we update in another PR since this one is pjs deps focused right ?
   Thank you in advance for the feedback!!! 🙏

[TarikGul]

We no longer update lerna dependency since we do not use in the release right ? Maybe we should update the README section also ?

We do still use lerna. But since that is a pretty important dep and has had some breaking changes that should be updated in its own PR.

Just confirming that other packages that have new versions like ts-jest, ts-node, tsconfig-paths, typedoc, typescript, etc we update in another PR since this one is pjs deps focused right ?
Thank you in advance for the feedback!!! 🙏

Similar to Lerna these should not be coupled in this PR and instead its own PR. Just makes it easier on us for debugging etc.

@types/node-fetch has already a new version 2.6.3.

👍