Update from master

Squashed commit of the following:

commit 1c0bfb77f2da82d5a6047f91c3df9d804dbd275e
Author: Gabriel Cuba <gcuba@whitestack.com>
Date:   Fri May 12 17:21:08 2023 -0500

    Update charset-normalizer to resolve dependency conflict

    Change-Id: I43a91a91029838bd0b0c0725b83c9d55251a4800
    Signed-off-by: Gabriel Cuba <gcuba@whitestack.com>

commit db266c39aa56ad25ebb9856b98b71b738cc2b59d
Author: Mark Beierl <mark.beierl@canonical.com>
Date:   Thu May 11 13:18:21 2023 -0400

    Removing charset constraint

    With py3.10, we are able to move to newer versions of the
    packages, so pinning to a lower version is no longer required

    Change-Id: I00410412e8fe473c93cef72a08d582d5aaaf1c58
    Signed-off-by: Mark Beierl <mark.beierl@canonical.com>

commit 072b0bdeb1a0919c5cc8de128fa3c62e8393ed7c
Author: Mark Beierl <mark.beierl@canonical.com>
Date:   Wed May 10 15:43:03 2023 -0400

    Update to Python 3.10 and Ubuntu 22.04

    Removal of deprecated event loop
    Updated pip requirements

    Change-Id: I96a895d8f9fa8db89e6bbfd6f009d4f56deaa418
    Signed-off-by: Mark Beierl <mark.beierl@canonical.com>

commit ca2fd226036f433ba97c427fbfdb08e2a339ab08
Author: garciadeblas <gerardo.garciadeblas@telefonica.com>
Date:   Tue Apr 4 15:26:09 2023 +0200

    Clean stage-archive.sh and use allowlist in tox.ini

    Change-Id: Ia360e247bf2f58aaa8477653ec1f161cf715a064
    Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Change-Id: Ib796b0f060d525b99488f883bbfce5af30aff2a7
Signed-off-by: Dario Faccin <dario.faccin@canonical.com>
diff --git a/Dockerfile b/Dockerfile
index c597522..27ab273 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@
 #   devops-stages/stage-build.sh
 #
 
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 ARG APT_PROXY
 RUN if [ ! -z $APT_PROXY ] ; then \
@@ -37,7 +37,9 @@
         python3 \
         python3-all \
         python3-dev \
-        python3-setuptools
+        python3-setuptools \
+        python3-pip \
+        tox
 
-RUN python3 -m easy_install pip==21.3.1
-RUN pip install tox==3.24.5
+ENV LC_ALL C.UTF-8
+ENV LANG C.UTF-8