Add Dependabot, Update Dependencies and Workflows (#1440)

Build may fail because of some major dependency updates. Needs changes,
changes/fixes welcomed.

Main goal is keeping all things up-to-date.

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Co-authored-by: weishu <twsxtd@gmail.com>

userspace/ksud/src/su.rs

@@ -217,7 +217,7 @@ pub fn root_shell() -> Result<()> {
         let name = &matches.free[free_idx];
         uid = unsafe {
             #[cfg(target_arch = "aarch64")]
-            let pw = libc::getpwnam(name.as_ptr() as *const u8).as_ref();
+            let pw = libc::getpwnam(name.as_ptr()).as_ref();
             #[cfg(target_arch = "x86_64")]
             let pw = libc::getpwnam(name.as_ptr() as *const i8).as_ref();