Fix CI without explicit Arduino.h include

Author: facchinm

Diff for: test/src/Stream/test_parseFloat.cpp

@@ -12,6 +12,8 @@
 
 #include <float.h>
 
+using namespace arduino;
+
 /**************************************************************************************
  * TEST CODE
  **************************************************************************************/

Diff for: test/src/Stream/test_parseInt.cpp

@@ -14,6 +14,8 @@
  * TEST CODE
  **************************************************************************************/
 
+using namespace arduino;
+
 TEST_CASE ("Testing parseInt(LookaheadMode lookahead = SKIP_ALL, char ignore = NO_IGNORE_CHAR)", "[Stream-parseInt-01]")
 {
   StreamMock mock;