Update gcp credentials for fuchsia_f6. (#29031)

.cirrus.yml

diff --git a/.cirrus.yml b/.cirrus.yml
index da0e3ed..a4fc4a3 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -1,4 +1,4 @@
-gcp_credentials: ENCRYPTED[!0e63b52bd7e4fda1cd7b7bf2b4fe515a27fadbeaced01f5ad8b699b81d3611ed64c5d3271bcd8426dd914ef41cba48a0!]
+gcp_credentials: ENCRYPTED[!48cff44dd32e9cc412d4d381c7fe68d373ca04cf2639f8192d21cb1a9ab5e21129651423a1cf88f3fd7fe2125c1cabd9!]
 
 # LINUX
 task: