[roll] Roll fuchsia [orchestrate] Add repository server helpers and prep strict client

Add getFreePort and parsePort helpers to ffx_strict.go. Add
TestGetFreePort to verify port acquisition. Update FFXStrictClient
struct with server lifecycle fields and update Close() to safely cancel
any running package server.

Original-Original-Bug: b/465157753
Test: host_x64/orchestrate_tests
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1648660
Original-Original-Revision: ddea697d38d5f48675671d314e707db821300890
GitOrigin-RevId: b72b2a93f4105755cfcb7c58466ea213ca600fde
Change-Id: I36a7a6e58adc085471c7eb7422adbe9e88dc705f

stem

diff --git a/stem b/stem
index 150005c..5dd816f 100644
--- a/stem
+++ b/stem
@@ -8,6 +8,6 @@
             manifest="manifests/platform"
             root=""
             remote="https://fuchsia.googlesource.com/fuchsia"
-            revision="94e32ecc9d6642266cd60a5f8935385d8e04ada7"/>
+            revision="ddea697d38d5f48675671d314e707db821300890"/>
   </imports>
 </manifest>