CI: refactor because node 12 will be dropped soon

[pheiduck]

actions-rs/toolchain@v1 not updated to node 16.

Fixed:

• [x] clippy does not report the same errors as actions-rs/toolchain.

[pheiduck]

@nabijaczleweli now its works like before (master state).

[pheiduck]

@nabijaczleweli I think we can merge these changes instead of waiting for the case to occur

[nabijaczleweli]

yeah, go on then