Auto merge of #66089 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum

[stable] 1.39.0 release
diff --git a/src/ci/run.sh b/src/ci/run.sh
index 8f0b4b5..c3f8e4c 100755
--- a/src/ci/run.sh
+++ b/src/ci/run.sh
@@ -45,7 +45,7 @@
 #
 # FIXME: need a scheme for changing this `nightly` value to `beta` and `stable`
 #        either automatically or manually.
-export RUST_RELEASE_CHANNEL=beta
+export RUST_RELEASE_CHANNEL=stable
 if [ "$DEPLOY$DEPLOY_ALT" = "1" ]; then
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --release-channel=$RUST_RELEASE_CHANNEL"
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-static-stdcpp"