tlbmc: Use non-throwing filesystem APIs in bmc_static_metrics

Google-Bug-Id:478925741
PiperOrigin-RevId: 992467845
Change-Id: I93004850d8fc43d815cabdeed7f84959f1ca99b1

gbmcweb

diff --git a/gbmcweb b/gbmcweb
index 13d9d89..1c5aab2 160000
--- a/gbmcweb
+++ b/gbmcweb
@@ -1 +1 @@
-Subproject commit 13d9d892ede549a7b74106194e48aa1a40194410
+Subproject commit 1c5aab2831272d0aeec09c2faa4c6a2a1be87f3f