Update the minimum version of databricks-labs-pytester to 0.7.2 (#408)

The [just
released](https://github.com/databrickslabs/pytester/releases/tag/v0.7.2)
version of `pytester` includes a fix for a breaking change that was
introduced by Databricks SDK 0.51: older versions of pytester will fail
to import if the new Databricks SDK is present.

This PR updates the test dependencies for this project to require that
version or later. This is mainly an informational change: it doesn't
affect normal installs of `lsql`, nor does it affect fresh installs of
this project for development because the latest version will be picked
up.

Author: asnare

pyproject.toml

@@ -46,7 +46,7 @@ dependencies = [
     "coverage[toml]>=6.5",
     "pytest",
     "pylint",
-    "databricks-labs-pytester>=0.5.0",
+    "databricks-labs-pytester>=0.7.2",
     "pytest-xdist",
     "pytest-cov>=4.0.0,<5.0.0",
     "pytest-mock>=3.0.0,<4.0.0",