Update CHANGELOG again for libaom v3.9.1

Bug: aomedia:3577
Change-Id: I69654f4cba6d6243bf1ecabde2b9bc43e73b58c4
diff --git a/CHANGELOG b/CHANGELOG
index 11d56ec..b98fb21 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,4 @@
-2024-06-03 v3.9.1
+2024-06-05 v3.9.1
   This release includes several bug fixes. This release is ABI
   compatible with the last release. See
   https://aomedia.googlesource.com/aom/+log/v3.9.0..v3.9.1 for all the
@@ -12,10 +12,14 @@
     * aomedia:3509: Fix two UBSan errors in av1_rc_update_framerate()
     * aomedia:3382, chromium:339877165: update codec config after
       svc/scale controls (CVE-2024-5493)
+    * aomedia:3561: libaom-3.8.2 armv7 Android build failed
     * aomedia:3571: {,highbd_}intrapred_neon.c: Avoid over-reads in z1
       and z3 preds
     * aomedia:3578: libaom-3.9.0 undefined reference to
       `aom_sub_pixel_variance16xh_ssse3'
+    * aomedia:3579: Use round for RC calculations in cyclic_refresh
+    * aomedia:3580: Allow g_timebase.num to be greater than
+      g_timebase.den
     * oss-fuzz:68774: libaom:av1_dec_fuzzer: Segv on unknown address in
       od_ec_dec_init
     * Arm SVE build fixes.