doc/sphinx/requirements.txt: Bump certifi and urllib3

As reported by GitHub dependabot, both of these packages should be
bumped to their latest versions to address security issues (neither of
which has a CVE assigned).

Reported-by: GitHub dependabot
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/sphinx/requirements.txt b/doc/sphinx/requirements.txt
index 306b05a..40dde59 100644
--- a/doc/sphinx/requirements.txt
+++ b/doc/sphinx/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.16
 Babel==2.15.0
-certifi==2024.6.2
+certifi==2024.7.4
 charset-normalizer==3.3.2
 docutils==0.20.1
 idna==3.7
@@ -22,4 +22,4 @@
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.7
 sphinxcontrib-serializinghtml==1.1.10
-urllib3==2.2.1
+urllib3==2.2.2