Remove charset-normalizer version constraint

Change-Id: I46311f74e949270278f685c50576f5884ba96227
Signed-off-by: Gabriel Cuba <gcuba@whitestack.com>
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.in b/requirements.in
index dea54a4..0195351 100644
--- a/requirements.in
+++ b/requirements.in
@@ -11,7 +11,8 @@
 #     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #     See the License for the specific language governing permissions and
 #     limitations under the License.
-charset-normalizer<3 # Required by aiohttp in LCM
+charset-normalizer
+google-auth<2.18.0
 juju==3.0.0
 kubernetes
 motor