Update qg's rustpython revision.

`rustpython-std` previously had a pinned `crossbeam-utils` dependency
which conflicts with other crates.

Change-Id: Ie292c2d6f8f7a0586ba96e9bf079c143deed1756
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/qg/+/126254
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Erik Gilling <konkers@google.com>
diff --git a/qg/Cargo.toml b/qg/Cargo.toml
index f4b1338..fb4c8cc 100644
--- a/qg/Cargo.toml
+++ b/qg/Cargo.toml
@@ -21,7 +21,7 @@
 
 [dependencies.rustpython]
 git = "https://github.com/RustPython/RustPython"
-rev = "f885db8c61514f069979861f6b3bd83292086231"
+rev = "ba427c86909f41451cbb76cd7301322afc817626"
 features = ["freeze-stdlib"]
 optional = true