ref-manual: releases.svg: Scarthgap is now version 5.0

According to https://wiki.yoctoproject.org/wiki/Releases

(From yocto-docs rev: 88348eb6eaa589a735b35b8ee726b9523f46e54f)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/svg/releases.svg

@@ -718,7 +718,7 @@
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-         id="tspan10317-2-9-1-4-6-5">4.4</tspan></text>
+         id="tspan10317-2-9-1-4-6-5">5.0</tspan></text>
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