fix: Hide 'deno cache' from help output (#25960)

`deno cache` was soft-deprecated in favor of `deno install`. It should
not show up in the help output.

cli/args/flags.rs

@@ -1176,7 +1176,6 @@ static DENO_HELP: &str = cstr!(
   <y>Tooling:</>
     <g>bench</>        Run benchmarks
                   <p(245)>deno bench bench.ts</>
-    <g>cache</>        Cache the dependencies
     <g>check</>        Type-check the dependencies
     <g>clean</>        Remove the cache directory
     <g>compile</>      Compile the script into a self contained executable

tests/integration/flags_tests.rs

@@ -21,7 +21,6 @@ fn help_output() {
     "Install script as an executable",
     "Uninstall a script previously installed with deno install",
     "Run benchmarks",
-    "Cache the dependencies",
     "Type-check the dependencies",
     "Compile the script into a self contained executable",
     "Print coverage reports",