update icon: raspberrypi (original, original-wordmark, plain, plain-wordmark, line, line-wordmark) (devicons#2076)

* update icon raspberrypi

* Updated colors to c51850

---------

Co-authored-by: Josélio Júnior <[email protected]>
Co-authored-by: Jørgen Kalsnes Hagen <[email protected]>

Author: 3 people

devicon.json

@@ -8546,10 +8546,14 @@
             "svg": [
                 "original",
                 "original-wordmark",
+                "plain",
+                "plain-wordmark",
                 "line",
                 "line-wordmark"
             ],
             "font": [
+                "plain",
+                "plain-wordmark",
                 "line",
                 "line-wordmark"
             ]