Release python agent version 2.14, with Python 3.8 support.

PiperOrigin-RevId: 283383931
Change-Id: I230ea2382c535b2c07e17c5eccafc9088d85f181

Author: jasonborg

src/googleclouddebugger/version.py

@@ -4,4 +4,4 @@
 # The major version should only change on breaking changes. Minor version
 # changes go between regular updates. Instances running debuggers with
 # different major versions will show up as two different debuggees.
-__version__ = '2.13'
+__version__ = '2.14'