fix release build

Author: Panaetius

.github/workflows/release.yaml

@@ -45,7 +45,7 @@ jobs:
         with:
           targets: ${{ matrix.platform.target }}
       - name: Install oas3-gen
-        run: cargo install oas3-gen
+        run: cargo install oas3-gen@0.21.1
       - name: Install build dependencies on Linux
         run: sudo apt-get update --yes && sudo apt-get install --yes musl-tools openssl libssl-dev
         if: contains(matrix.platform.os, 'ubuntu')