update pytorch pin to 08/21

Differential Revision: D61612446

Pull Request resolved: #4820

Author: lucylq

.ci/docker/ci_commit_pins/pytorch.txt

@@ -1 +1 @@
-b556d31586845fb1e296a975d2b85d9d325205c9
+c42ac54d9e817bf0a0366eb78e6c8beba4d5eff5

.ci/scripts/utils.sh

@@ -19,11 +19,9 @@ retry () {
 install_executorch() {
   which pip
   # Install executorch, this assumes that Executorch is checked out in the
-  # current directory. The --extra-index-url options tell pip to look on the
-  # pytorch servers for nightly and pre-release versions of torch packages.
-  pip install . --no-build-isolation -v \
-      --extra-index-url https://download.pytorch.org/whl/test/cpu \
-      --extra-index-url https://download.pytorch.org/whl/nightly/cpu
+  # current directory.
+  # TODO(T199538337): clean up install scripts to use install_requirements.sh
+  ./install_requirements.sh --pybind xnnpack
   # Just print out the list of packages for debugging
   pip list
 }

install_requirements.py

@@ -89,7 +89,7 @@ def python_is_compatible():
 # NOTE: If a newly-fetched version of the executorch repo changes the value of
 # NIGHTLY_VERSION, you should re-run this script to install the necessary
 # package versions.
-NIGHTLY_VERSION = "dev20240716"
+NIGHTLY_VERSION = "dev20240821"
 
 # The pip repository that hosts nightly torch packages.
 TORCH_NIGHTLY_URL = "https://download.pytorch.org/whl/nightly/cpu"