Revert "Temporarily pin IREE release"

This reverts commit b2f9bfd86a1ef2a75ad62bbcc2efd7249e7e14a1.

Reason for revert: Fix landed upstream

Bug: 321543254
Change-Id: I95d5933ca20915607dbea85a8c94b26d9e57d7c3

manifest.xml

diff --git a/manifest.xml b/manifest.xml
index 9231376..201ffdd 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -57,8 +57,7 @@
   <!-- END cantrip components -->
 
   <!-- BEGIN ML toolchain-->
-  <!-- TODO(b/318408783): unpin the IREE release -->
-  <project revision="4592b8f5a95f8f3a6da574df83b81600169947a5" name="3p/openxla/iree" path="toolchain/iree" />
+  <project revision="latest-snapshot" name="3p/openxla/iree" path="toolchain/iree" />
   <project name="sw/vec_iree"                     path="sw/vec_iree" />
   <project name="ml-models-public"                path="ml/ml-models-public" />
   <!-- END ML toolchain -->