[roll third_party/pigweed] pw_env_setup: Remove unused pep517 package

- pep517 is not required by any other Python package.
- tomli is only needed if Python version is < 3.11.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/162072

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 93549eb6ce67bdd..b59099bc638b6c9
Roller-URL: https://ci.chromium.org/b/8773853086854467633
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I2dc7a601ba3baf5fe2093b6fcd5dfa4e9c697e02
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/162351
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 93549eb..b59099b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 93549eb6ce67bdd7663c28ef4971933a39f6e2c3
+Subproject commit b59099bc638b6c935314295e83ac8c1e1983d91e