Pygsti is incompatible with scipy 1.12

[eendebakpt]

Describe the bug Using pygsti fails on the import of colvolve from scipy (which is no longer available from the main scipy namespace in version 1.12)

To Reproduce Steps to reproduce the behavior:

1. Install scipy 1.12 (latest on pypi) and pygsti
2. Using pygsti fails on the import of colvolve from scipy at line

https://github.com/sandialabs/pyGSTi/blob/7411a00ec81e67f50932b705e46426fc2d4701d8/pygsti/extras/drift/signal.py#L13

Environment (please complete the following information):

• pyGSTi version [e.g. v0.9.7.4] '0.9.10.1.post449'
• python version [e.g. 3.7, 2.7] 3.11
• OS [e.g. OSX 10.14, Ubuntu 16.04 LTS] Windows

[sserita]

Fixed in #392