Update core integrations to test on python 3.14

[sjrl]

As a follow up to deepset-ai/haystack#10509 we should go through our integrations and update them to test on python 3.14 and if able/necessary update the code to support python 3.14

To avoid running too many tests we should replace the python 3.13 testing in our github workflows to python 3.14 and let's make sure to add python 3.14 listed support to our pyprojec.toml under the classifiers label

[anakin87]

Started to experiment in #2999

The following integrations have failing CI.

Run unit tests with lowest direct dependencies
In this case, it might be sufficient to update the pin, choosing the first version which supports 3.14.

• astra
• chroma
• hanlp
• ollama
• optimum
• valkey

Run tests
Should be investigated but these packages might not be ready for 3.14

• fastembed
• langfuse
• watsonx

[anakin87]

Done in #3001 and #3033.

Three integrations are not yet compatible, and I created the following issues to track them: #3034, #3035, #3036.