Pin dependency versions

[Robbybp]

• Pyomo: 6.7.0
• IDAES: 2.4.0
• TensorFlow: 2.15.0

With most recent versions, we can't read the .pb files in the load_from_file method on SurrogateBlock.

[Robbybp]

I think we actually need pyomo>6.7.0 for some of the options and performance improvements in solve_strongly_connected_components. I'm not sure if there is a minor version that satisfies this and works with IDAES 2.4.0. If not, we should update our training script to write .keras files and the rest of our code to reflect this.

I'm doing some work with the trained NNs at the moment, but I'll update this when I'm done.

[Robbybp]

I'm not that concerned with the regression when updating to IDAES 2.5, as we have a tag for FOCAPD 2024.