doc/sphinx: Bump Jinja2 to 3.1.4

While we unlikely to have an issue with CVE-2024-22195, it is simple
enough to bump our version of Jinja2 to receive the fix, do so.

Reported-by: GitHub dependabot
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/doc/sphinx/requirements.txt b/doc/sphinx/requirements.txt
index 5b4df36..426f41e 100644
--- a/doc/sphinx/requirements.txt
+++ b/doc/sphinx/requirements.txt
@@ -5,7 +5,7 @@
 docutils==0.20.1
 idna==3.7
 imagesize==1.4.1
-Jinja2==3.1.3
+Jinja2==3.1.4
 MarkupSafe==2.1.3
 packaging==23.2
 Pygments==2.17.2