docs: add sha256 checksums for 13.0.1

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit b47ce6ddb8be51d72d40ea0abc3d77b667c8552f)
diff --git a/docs/relnotes/13.0.1.html b/docs/relnotes/13.0.1.html
index d317adb..0ce9fc1 100644
--- a/docs/relnotes/13.0.1.html
+++ b/docs/relnotes/13.0.1.html
@@ -31,7 +31,8 @@
 
 <h2>SHA256 checksums</h2>
 <pre>
-TBD
+7cbb91dead05cde279ee95f86e8321c8e1c8fc9deb88f12e0f587672a10d88c5  mesa-13.0.1.tar.gz
+71962fb2bf77d33b0ad4a565b490dbbeaf4619099c6d9722f04a73187957a731  mesa-13.0.1.tar.xz
 </pre>