rustup version needs a bump

[EmperorOrokuSaki]

The current rustup version used in the docker (1.67.0) is incompatible with the latest candid crate, thus deploying custom canisters in the docker instance is not possible with the latest dependencies.
The error:

error: package `candid v0.10.7` cannot be built because it requires rustc 1.70.0 or newer, while the currently active rustc version is 1.67.0
Either upgrade to rustc 1.70.0 or newer, or use

Will create a pr for this. Please lmk if except for the dockerfile I need to update anything else.