ci(kernel): bump KERNEL_REV to the build carrying the pyo3 Azure SP surface

Point kernel-e2e's KERNEL_REV at the kernel commit that adds the pyo3
azure-sp-m2m surface (databricks-sql-kernel#263), so the connector's kernel-e2e
builds a kernel wheel that can accept auth_type='azure-sp-m2m'. Temporary pin to
the unmerged #263 branch tip; re-point to a kernel main SHA once #263 merges and
a release is cut. Customer-facing pin (pyproject databricks-sql-kernel ^0.2.0)
still needs a release bump to a published kernel with #263.

Co-authored-by: Isaac
Signed-off-by: eric-wang-1990 <e.wang@databricks.com>

Author: eric-wang-1990

KERNEL_REV

@@ -1 +1 @@
-9e3dbf9c40733b176151e001c9a15202030b967a
+ad78a5be3dc8bb7fc78ec574492515ab24e23d4c