Test Stream::parseFloat() with a huge number of digits

Give a 311-digit number to Stream::parseFloat(). This makes the local
variable `value' overflow to infinity. With so many digits, the number
cannot be parsed into an integer, not even into an integer stored as a
`double'.

Note that 40 digits would be enough to unveil this issue on AVR.

Author: edgar-bonet

test/src/Stream/test_parseFloat.cpp

@@ -47,7 +47,7 @@ TEST_CASE ("Testing parseFloat(LookaheadMode lookahead = SKIP_ALL, char ignore =
   }
   WHEN ("A float is provided with too many digits after the decimal point")
   {
-    mock << "3.1415926535897932384";
+    mock << "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870064";
     REQUIRE(mock.parseFloat() == Approx(3.141592654f));
   }
   WHEN ("A float is larger than LONG_MAX")