[Feature]: Support for 64 bit Team Fortress 2 binary

### User story

Scaling up servers well beyond the typical 32 slot is very hard with the older 32 bit binaries, 64 bit in theory enables a much broader support for higher performing hardware and scaling up servers to larger configurations

### Game

Team Fortress 2

### Linux distro

Ubuntu 24.04

### Command

command: install

### Further information

Current SteamCMD already ships with both x86 and x64 SRCDS binaries which are downloaded by LinusGSM, however, only `srcds_run` is being executed in the server launch command while the user doesn't have the ability to use `srcds_run_64` as an option if they're running beefier hardware platforms or willing to host larger servers - eg. 100x player servers.

This seems to be a very low hanging fruit as it would just require updating the current server start script to run `srcds_run_64` instead of `srcds_run` since all the software is already capable of running x64 code and ships with both binaries as default anyways.