runtime(cpp): Fix c++ float and integer literal syntax highlighting

closes: #8939

Co-authored-by: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
Signed-off-by: Dominique Pelle <dominique.pelle@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/cpp_numbers.cpp

@@ -0,0 +1,20 @@
+void foo()
+{
+    {
+        // See https://en.cppreference.com/w/cpp/language/floating_literal
+        double a = 1.0E2;
+        double b = 1.0e2;
+        double c = 1E2;
+        double d = 1e2;
+
+        double e = 0X1ffp10;
+        double f = 0x1ffp10;
+    }
+
+    // See: https://en.cppreference.com/w/cpp/language/integer_literal
+    int a = 0X123;
+    int b = 0x123;
+
+    int c = 0B101;
+    int d = 0b101;
+}