Use fixed version for exploy (#86)

### What change is being made

Instead of dynamically determining the version from git, we use a fixed
one.

### Why this change is being made

The dynamic versioning invalidated the pixi.lock file when mirrored to
another repository.

### Tested

Confirmed successful sync between repositories.

GitOrigin-RevId: c294b2acb3e0fcae6c770948b35d4d8123002ab1

Author: awoll-bdai

pixi.lock

@@ -80,7 +80,8 @@ requires = ["hatchling", "hatch-vcs"]
 source = "vcs"
 
 [tool.hatch.version.raw-options]
-version_scheme = "no-guess-dev"
+version_scheme = "only-version"
+local_scheme = "no-local-version"
 
 [tool.hatch.build.hooks.vcs]
 version-file = "python/exploy/_version.py"