docs: add sha256 checksums for 11.0.9

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/relnotes/11.0.9.html b/docs/relnotes/11.0.9.html
index 3a49326..3bfb52b 100644
--- a/docs/relnotes/11.0.9.html
+++ b/docs/relnotes/11.0.9.html
@@ -31,7 +31,8 @@
 
 <h2>SHA256 checksums</h2>
 <pre>
-TBD
+1597c2e983f476f98efdd6cd58b5298896d18479ff542bdeff28b98b129ede05  mesa-11.0.9.tar.gz
+a1262ff1c66a16ccf341186cf0e57b306b8589eb2cc5ce92ffb6788ab01d2b01  mesa-11.0.9.tar.xz
 </pre>