Bump IREE requirement pins to 3.4.0rc20250416 (#1268)

Diff:
iree-org/iree@iree-3.4.0rc20250409...iree-3.4.0rc20250416

IREE bump duty engineer this week: @AmosLewis

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requirements-iree-pinned.txt

@@ -2,6 +2,6 @@
 
 # Keep these versions synced with SHORTFIN_IREE_GIT_TAG in shortfin/CMakeLists.txt
 --find-links https://iree.dev/pip-release-links.html
-iree-base-compiler==3.4.0rc20250409
-iree-base-runtime==3.4.0rc20250409
-iree-turbine==3.4.0rc20250409
+iree-base-compiler==3.4.0rc20250416
+iree-base-runtime==3.4.0rc20250416
+iree-turbine==3.4.0rc20250416

shortfin/CMakeLists.txt

@@ -47,7 +47,7 @@ add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
 # Prefer to keep the IREE git tag synced with the Python package version in the
 # requirements-iree-pinned.txt file. At a minimum, the compiler from those
 # packages must be compatible with the runtime at this source ref.
-set(SHORTFIN_IREE_GIT_TAG "iree-3.4.0rc20250409")
+set(SHORTFIN_IREE_GIT_TAG "iree-3.4.0rc20250416")
 
 
 # build options