[Fuchsia] Bump the target API level to 9

Change-Id: I1188b8dd66aad338de83d685665de4662cd7cc9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3779735
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1027417}

diff --git a/.gn b/.gn
index 7d538f8..bc38d48 100644
--- a/.gn
+++ b/.gn

@@ -58,7 +58,7 @@
   # Overwrite default args declared in the Fuchsia sdk
   fuchsia_sdk_readelf_exec =
       "//third_party/llvm-build/Release+Asserts/bin/llvm-readelf"
-  fuchsia_target_api_level = 8
+  fuchsia_target_api_level = 9
 
   devtools_visibility = [ "*" ]
 }