chore: release 1.30.0 (#741)

* chore: release 1.30.0

* chore: update changelog

* chore: update changelog

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: arithmetic1728 <liusijun1985@gmail.com>
diff --git a/google/auth/version.py b/google/auth/version.py
index abae313..4a28e39 100644
--- a/google/auth/version.py
+++ b/google/auth/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.29.0"
+__version__ = "1.30.0"