chore: remove starknet-contract-class (#766)

* Remove `override: true` from dtolnay actions

It's not a valid option

* Move starknet-contract-class to SiR

* Remove `ParsedContractClass`

Author: MegaRedHand

.github/workflows/rust-tests.yml

@@ -19,7 +19,6 @@ jobs:
       uses: dtolnay/rust-toolchain@stable
       with:
           toolchain: ${{ env.RUST_TOOLCHAIN }}
-          override: true
           components: rustfmt, clippy
     - uses: Swatinem/rust-cache@v2
       with:
@@ -41,7 +40,6 @@ jobs:
       uses: dtolnay/rust-toolchain@stable
       with:
           toolchain: ${{ env.RUST_TOOLCHAIN }}
-          override: true
           components: rustfmt, clippy
     - uses: Swatinem/rust-cache@v2
       with:
@@ -65,7 +63,6 @@ jobs:
       uses: dtolnay/rust-toolchain@stable
       with:
           toolchain: ${{ env.RUST_TOOLCHAIN }}
-          override: true
           components: rustfmt, clippy
     - uses: Swatinem/rust-cache@v2
       with: