fix: ci use anchor 31 (#524)

Co-authored-by: Barnabas Ratki <barna@dourolabs.xyz>

Author: Dewyer

.github/workflows/ci-pre-commit.yml

@@ -39,8 +39,8 @@ jobs:
       - name: Install Anchor CLI
         run: |
           cargo install --git https://github.com/coral-xyz/anchor avm
-          avm install latest
-          avm use latest
+          avm install 0.31.0
+          avm use 0.31.0
       - uses: pre-commit/action@v3.0.0
         if: ${{ github.event_name == 'pull_request' }}
         with: