[roll] Roll fuchsia [bazel] out-of-build generate_invocation_bazelrc

Allow use of generate_invocation_bazelrc.py outside
of fx/infra builds.
Fail safe return and don't modify bazelrc config definitions
in this case.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1482960
Original-Revision: 0d84934e25e162c744d4d7e4a1237386ed1e6780
GitOrigin-RevId: c0d80e9cc8d9ad16f49598f023e699038b383763
Change-Id: Ifa2b03351803e45ef00e9abfb22a320fbf60c2b4
diff --git a/stem b/stem
index 90e88c3..e1ed264 100644
--- a/stem
+++ b/stem
@@ -7,7 +7,7 @@
             manifest="manifests/platform"
             root=""
             remote="https://fuchsia.googlesource.com/fuchsia"
-            revision="20663d9a57b2c13c823082e51da2b11ae626b271"/>
+            revision="0d84934e25e162c744d4d7e4a1237386ed1e6780"/>
   </imports>
   <projects>
     <project name="cobalt"