[pygobject] poetry: add support for sphinx v4 and sphinx-rtd-theme v1

[Christoph Reiter <creiter src gnome org>]

commit b6399765536da6c3843e2f9119b34abdf837ce38
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun Sep 19 15:38:00 2021 +0200

    poetry: add support for sphinx v4 and sphinx-rtd-theme v1
    
    Tested with 4.2 and 1.0 and things loog good

 pyproject.toml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pyproject.toml b/pyproject.toml
index a6bf6918..8dae0503 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,8 +11,8 @@ pycairo = "^1.16"
 [tool.poetry.dev-dependencies]
 pytest = "^6.0.0"
 flake8 = "^3.9.1"
-Sphinx = "^3.5.4"
-sphinx-rtd-theme = "^0.5.2"
+Sphinx = "^3.5.4|^4.2.0"
+sphinx-rtd-theme = "^0.5.2|^1.0.0"
 coverage = "^5.5"
 
 [build-system]