fix outdated Solana install URL

Author: mikemaccana

.github/workflows/tests.yaml

@@ -13,10 +13,12 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: metadaoproject/setup-solana@v1.0
-        with:
-          # Install Solana CLI (beta, required to fix 'ahash' issue)
-          solana-cli-version: "1.18.5"
+
+      - name: Install Solana CLI
+        run: sh -c "$(curl -sSfL https://release.anza.xyz/v1.18.5/install)"
+
+      - name: Add Solana bin to PATH
+        run: echo "$HOME/.local/share/solana/install/active_release/bin" >> $GITHUB_PATH
 
       - name: Setup Node.js version
         uses: actions/setup-node@v4