fix: don't generate borsh::to_vec if no borsh traits (#12)

Author: buffalojoec

.changeset/puny-guests-grow.md

@@ -0,0 +1,5 @@
+---
+'@codama/renderers-rust': patch
+---
+
+Don't generate `borsh::to_vec` if no borsh traits

.github/workflows/main.yml

@@ -10,6 +10,7 @@ env:
   DO_NOT_TRACK: '1'
   NODE_VERSION: 20
   SOLANA_VERSION: 2.1.9
+  RUST_TOOLCHAIN: '1.86.0'
 
 jobs:
   lint:
@@ -44,6 +45,12 @@ jobs:
       - name: Git checkout
         uses: actions/checkout@v4
 
+      - name: Install Rust Toolchain and Components
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_TOOLCHAIN }}
+          components: clippy, rustfmt
+
       - name: Install Solana ${{ env.SOLANA_VERSION }}
         uses: solana-program/actions/install-solana@v1
         with: