fix: pin k6 version to v0.52.0

Author: szkiba

.github/workflows/build.yml

@@ -19,3 +19,4 @@ jobs:
         uses: szkiba/xk6bundler@v0
         with:
           with: github.com/grafana/xk6-python=/github/workspace
+          k6_version: v0.52.0

.github/workflows/release.yml

@@ -22,6 +22,7 @@ jobs:
         uses: szkiba/xk6bundler@v0
         with:
           with: github.com/grafana/xk6-python=/github/workspace
+          k6_version: v0.52.0
 
       - name: Create Release
         uses: softprops/action-gh-release@v2

README.md

@@ -76,3 +76,7 @@ Check the [documentation](https://grafana.github.io/xk6-python/) for available m
 ## Contribute
 
 If you would like to contribute, start by reading [Contributing Guidelines](https://grafana.github.io/xk6-python/CONTRIBUTING.html).
+
+## k6 version
+
+xk6-python is currently compatible with k6 v0.52.0. It is possible that it works with other versions, but it has not been tested.