tests: patman: Add requests to the module list

The patman tests require the requests module, add it.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/test/py/requirements.txt b/test/py/requirements.txt
index 5b48292..33c5c0b 100644
--- a/test/py/requirements.txt
+++ b/test/py/requirements.txt
@@ -17,6 +17,7 @@
 pytest==5.2.1
 python-mimeparse==1.6.0
 python-subunit==1.3.0
+requests==2.25.1
 six==1.12.0
 testtools==2.3.0
 traceback2==1.4.0