Make depedabot use Python v3.8.

Update release notes.

Author: adityatoshniwal

.python-version

@@ -0,0 +1 @@
+3.8.0

docs/en_US/release_notes_9_0.rst

@@ -25,6 +25,7 @@ New features
 
 Housekeeping
 ************
+  | `Issue #8249 <https://github.com/pgadmin-org/pgadmin4/issues/8249>`_ -  Show the python version used for the pgAdmin server in the about dialog.
 
 
 Bug fixes
@@ -34,4 +35,6 @@ Bug fixes
   | `Issue #8072 <https://github.com/pgadmin-org/pgadmin4/issues/8072>`_ -  Fixed an issue where Schema Diff not produce difference script for Index definition with where condition.
   | `Issue #8142 <https://github.com/pgadmin-org/pgadmin4/issues/8142>`_ -  Correct the documentation for the MFA configuration.
   | `Issue #8208 <https://github.com/pgadmin-org/pgadmin4/issues/8208>`_ -  Allow deleting the entry while creating/adding new label to enumeration type.
-  | `Issue #8209 <https://github.com/pgadmin-org/pgadmin4/issues/8209>`_ -  Fixed an issue where properties dialog throwing an error for Materialized View.
+  | `Issue #8209 <https://github.com/pgadmin-org/pgadmin4/issues/8209>`_ -  Fixed an issue where properties dialog throwing an error for Materialized View.
+  | `Issue #8254 <https://github.com/pgadmin-org/pgadmin4/issues/8254>`_ -  Fix a formatting issue in View/Edit tool generated SQL where some filters are applied.
+  | `Issue #8255 <https://github.com/pgadmin-org/pgadmin4/issues/8255>`_ -  Fixed an issue where tooltip on a dropdown button is blocking access to dropdown menu.

requirements.txt

@@ -38,6 +38,7 @@ ldap3==2.*
 gssapi==1.9.*
 user-agents==2.2.0
 pywinpty==2.0.*; sys_platform=="win32"
+Authlib==1.3.*; python_version <= '3.8'
 Authlib==1.4.*
 pyotp==2.*
 qrcode==7.*; python_version <= '3.8'