Update emsdk in samples workflow. (#19490)

Fixes https://github.com/iree-org/iree/issues/19425. The newer emsdk is
needed to link when we produce executables with newer LLVM cpu features.

Tested here: https://github.com/ScottTodd/iree/actions/runs/12356828162

.github/workflows/samples.yml

diff --git a/.github/workflows/samples.yml b/.github/workflows/samples.yml
index d132217..0fce80d 100644
--- a/.github/workflows/samples.yml
+++ b/.github/workflows/samples.yml
@@ -95,7 +95,7 @@
       - name: "Setup emsdk"
         uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
         with:
-          version: 3.1.44
+          version: 3.1.74
       - name: "Test experimental web samples"
         env:
           HOST_TOOLS_BINARY_DIR: ${{ env.VENV_DIR }}/bin