[gi-docgen] Post-release version bump to 2021.6

[Emmanuele Bassi <ebassi src gnome org>]

commit 5cdacc10cb016f0c6d601e0315c102bc2d505b45
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Apr 15 16:13:35 2021 +0100

    Post-release version bump to 2021.6

 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 5fef1d2..c02346b 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 = "2021.5"
+version = "2021.6"
diff --git a/meson.build b/meson.build
index 1c067cc..28b73e7 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: '2021.5',
+  version: '2021.6',
   meson_version: '>= 0.55.0',
 )