deprecate 20.04

Signed-off-by: Trecia Agoylo <trecia.agoylo@analog.com>

Author: tagoylo

.github/workflows/build_dev.yml

@@ -27,7 +27,6 @@ jobs:
             "libiio-fedora-28",
             "libiio-centos-7",
             "libiio-opensuse-15.4",
-            "test-harness-ubuntu-20_04",
             "test-harness-ubuntu-22_04",
             "pyadi-iio-python-3_7",
             "pyadi-iio-python-3_8",
@@ -67,9 +66,6 @@ jobs:
           - project: "libiio-opensuse-15.4"
             DOCKERFILE: "libiio/Dockerfile-opensuse-15.4"
             TAG_ROOT: "libiio_opensuse_15_4-ci"
-          - project: "test-harness-ubuntu-20_04"
-            DOCKERFILE: "test-harness/Dockerfile-test-harness"
-            TAG_ROOT: "test-harness-ci"
           - project: "test-harness-ubuntu-22_04"
             DOCKERFILE: "test-harness/Dockerfile-test-harness-ubuntu22-04"
             TAG_ROOT: "test-harness-ci-ubuntu-22_04"