Updating support for benchmark language versions

[mcopik]

Since our last release, certain language runtimes have been deprecated, and new ones have been added. In preparation for the next release, we now need to prune the language versions that are no longer supported and add new ones.

We should drop the support for Python/Node.js which are no longer deployable to clouds; this change should be done separately for each cloud, e.g., drop Python 3.7 where it's no longer supported.

Systems/languages to support;

• [x] AWS, Python
• [x] AWS, Node.js
• [ ] Azure, Python
• [ ] Azure, Node.js
• [ ] GCP, Python
• [ ] GCP, Node.js
• [ ] OpenWhisk, Python
• [ ] OpenWhisk, Node.js