feat: Add Min-Server-Version header support

[zvikagart]

Code Ocean API now supports enforcing minimum server version requirements through the Min-Server-Version header. When a client specifies this header, the server will validate that its version meets the minimum requirement before processing the request. When the server version is insufficient or the header format is invalid, the API returns 400 Bad Request.

[Copilot]

Pull Request Overview

This PR introduces support for enforcing a minimum server version by adding a Min-Server-Version header to all API requests.

• Sets a default "Min-Server-Version": "3.6.0" header in the client session
• Does not yet provide a way to customize or test this header behavior

Comments suppressed due to low confidence (2)

src/codeocean/client.py:41

• Currently the header is always sent; to match the description, allow clients to opt in by adding a constructor argument or setter so the header is only included when explicitly requested.

            "Min-Server-Version": "3.6.0",

src/codeocean/client.py:39

• No tests cover the new Min-Server-Version header; add unit tests to verify that the header is set correctly and that invalid formats are handled as expected.

        self.session.headers.update({

[ramdayan]

Why 3.6.0?

[zvikagart]

Fair question.
Putting the new optional headers support aside, this is the system version that this SDK supports.
I didn't want to prevent users from using the latest SDK (0.8.0 that we'll release) with CO v3.6.0

[ramdayan]

Since the version is not checked in all CO versions so far it doesn't really matter so I guess it's fine, but we can also check when was the last change to the API and pin the correlating version. Up to you.