docs: add release notes for 12.0.5
docs: add release notes for 12.0.5

Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
(cherry picked from commit 01579a9d007830f2f905646c9d1f9bd0a03caa89)

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler