Update charset-normalizer to resolve dependency conflict

Change-Id: I43a91a91029838bd0b0c0725b83c9d55251a4800
Signed-off-by: Gabriel Cuba <gcuba@whitestack.com>
diff --git a/requirements-test.in b/requirements-test.in
index 394c6c3..dab3c72 100644
--- a/requirements-test.in
+++ b/requirements-test.in
@@ -20,7 +20,7 @@
 # contact: helena.mcgough@intel.com or adrian.hoban@intel.com
 ##
 certifi
-charset-normalizer<3 # Required by aiohttp in LCM via N2VC
+charset-normalizer
 coverage
 mock
 nose2