Python: Convert to Tr::tr

Change-Id: I0241053b0d51dbb1a60c43351cbff543fd52573d
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/python/pipsupport.h

@@ -32,8 +32,7 @@
 #include <QTimer>
 #include <QUrl>
 
-namespace Python {
-namespace Internal {
+namespace Python::Internal {
 
 class PipPackageInfo;
 
@@ -97,5 +96,4 @@ private:
     QTimer m_killTimer;
 };
 
-} // namespace Internal
-} // namespace Python
+} // Python::Internal