Upgrading matplotlib to last stable version to support pytho 3.8 used on the test setups

Change-Id: I8abd62f7bd92eb4a3208510e42589a8063363c66
diff --git a/VERSION b/VERSION
index a4dd9db..a603bb5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.7.4
+2.7.5
diff --git a/requirements.txt b/requirements.txt
index 39b5499..0b0c21a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,8 +11,8 @@
 git+https://github.com/zdw/robotframework-importresource@b81b87aabaee0594e966687b41e3674b866f28ee
 cord-robot==2.1.4
 virtualenv
-matplotlib==3.0.3
+matplotlib>=3.0.3
 requests==2.24.0
 grpc-robot>=2.0.0
 kafka-robot>=2.0.0
-device-management-interface>=0.9.4
\ No newline at end of file
+device-management-interface>=0.9.4