Revert "feat(artifacts): parallel downloads (#214)"

This reverts commit 9d38c9b.

Author: 0xernesto

.github/actions/setup/action.yml

@@ -39,14 +39,14 @@ runs:
                   ~/.cargo/git/db/
                   target/
                   ~/.rustup/
-              key: rust-1.88.0-${{ hashFiles('**/Cargo.toml') }}
-              restore-keys: rust-1.88.0-
+              key: rust-1.86.0-${{ hashFiles('**/Cargo.toml') }}
+              restore-keys: rust-1.86.0-
 
         - name: Setup toolchain
           id: rustc-toolchain
           shell: bash
           run: |
-              curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain 1.88.0 -y
+              curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain 1.86.0 -y
               rustup install nightly
 
         - name: "Install sp1up"

.github/workflows/pr.yml

@@ -86,11 +86,11 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
-          toolchain: 1.88.0
+          toolchain: 1.86.0
           args: --release
         env:
           RUST_BACKTRACE: 1
-          RUSTUP_TOOLCHAIN: 1.88.0
+          RUSTUP_TOOLCHAIN: 1.86.0
 
   cargo-lint:
     name: Cargo Lint

.gitignore

@@ -1,6 +1,9 @@
 # Ignore build artifacts
 /target/
 
+# Ignore lock files
+Cargo.lock
+
 # Ignore environment files
 .env