remove direct dependency on cargo-near-build in some of examples

[dj8yfo]

this is 6-liner TODO, which depends on near/near-workspaces-rs#386 to remove direct import and use reexported version.

it also depends on merge of #1253 , but can be done in scope of #1253, if near/near-workspaces-rs#386 is published first

• examples/non-fungible-token/Cargo.toml
  • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/non-fungible-token/Cargo.toml#L14
• examples/lockable-fungible-token/Cargo.toml
  • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/lockable-fungible-token/Cargo.toml#L18
• examples/fungible-token/Cargo.toml
  • https://github.com/dj8yfo/near-sdk-rs/blob/b4b3dff0ef5a3f30841348a80461efc56f97945f/examples/fungible-token/Cargo.toml#L12