Upgrade CPU capacity of bridge

The snowflake bridge is currently using most of its 4 CPUs. Most of the use is by snowflake-server. This was noticed by @meskio at #40060 (comment 2767868).

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
 1822 debian-+  20   0 4020400   2.0g   8192 R 250.7  26.4 156:08.20 snowflake-server
 1821 debian-+  20   0  831256 521804 106116 R  82.7   6.4  53:23.49 tor
 1779 snowfla+  20   0 1305556  47036   9068 S  16.0   0.6   6:27.23 proxy-go
 1788 snowfla+  20   0 1231824  43688   8988 S  10.7   0.5   3:18.65 proxy-go

We should probably profile snowflake-server to find the hotspots to reduce its CPU usage (#40086 (closed)), but for now we can redeploy on hardware with more CPUs. We're still doing okay with memory.

We are currently using

• 8 GiB / 4 CPU cores (40.75 credits)

And our options for upgrading are

• 12 GiB / 6 CPU cores (60.75 credits)
• 16 GiB / 8 CPU cores (80.75 credits)

I would tend to push it to the max, seeing how user growth is going.

A previous bridge upgrade issue was #40051 (closed).