Add "Instrument Drivers" classifier (#65)

- [x] This contribution adheres to
[CONTRIBUTING.md](https://github.com/ni/nisync-python/blob/main/CONTRIBUTING.md).

### What does this Pull Request accomplish?

Update the nisync package to use the new `Topic ::
Scientific/Engineering :: Instrument Drivers` classifier added in
pypa/trove-classifiers#221

### Why should this Pull Request be merged?

Aid package discoverability on PyPI.

### What testing has been done?

N/A

Signed-off-by: Brad Keryan <[email protected]>

Author: bkeryan

pyproject.toml

@@ -21,6 +21,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Scientific/Engineering",
+    "Topic :: Scientific/Engineering :: Instrument Drivers",
     "Topic :: System :: Hardware",
 ]
 include = ["nisync/*"]