[gi-docgen] Post-release version bump to 2021.9

[Emmanuele Bassi <ebassi src gnome org>]

commit e4de9f60e266763b7679163d994efd4c9660f7f2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Oct 21 15:03:19 2021 +0100

    Post-release version bump to 2021.9

 gidocgen/core.py | 2 +-
 meson.build      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gidocgen/core.py b/gidocgen/core.py
index e8e8682..b1e3ae6 100644
--- a/gidocgen/core.py
+++ b/gidocgen/core.py
@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: 2020 GNOME Foundation <https://gnome.org>
 # SPDX-License-Identifier: Apache-2.0 OR GPL-3.0-or-later
 
-version = "2021.8"
+version = "2021.9"
diff --git a/meson.build b/meson.build
index 5bd5d23..62c4de2 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0 OR GPL-3.0-or-later
 
 project('gi-docgen',
-  version: '2021.8',
+  version: '2021.9',
   meson_version: '>= 0.55.0',
 )