Update Rust and Crates and GHA (#6843)

- Update Rust to v1.93.1
- Updated all the crates
  Adjust changes needed for the newer `rand` crate
- Updated GitHub Actions

Signed-off-by: BlackDex <black.dex@gmail.com>

src/api/core/accounts.rs

@@ -1199,10 +1199,9 @@ async fn password_hint(data: Json<PasswordHintData>, conn: DbConn) -> EmptyResul
                 // There is still a timing side channel here in that the code
                 // paths that send mail take noticeably longer than ones that
                 // don't. Add a randomized sleep to mitigate this somewhat.
-                use rand::{rngs::SmallRng, Rng, SeedableRng};
-                let mut rng = SmallRng::from_os_rng();
-                let delta: i32 = 100;
-                let sleep_ms = (1_000 + rng.random_range(-delta..=delta)) as u64;
+                use rand::{rngs::SmallRng, RngExt};
+                let mut rng: SmallRng = rand::make_rng();
+                let sleep_ms = rng.random_range(900..=1100) as u64;
                 tokio::time::sleep(tokio::time::Duration::from_millis(sleep_ms)).await;
                 Ok(())
             } else {

src/api/identity.rs

@@ -975,12 +975,11 @@ async fn register_verification_email(
         let user = User::find_by_mail(&data.email, &conn).await;
         if user.filter(|u| u.private_key.is_some()).is_some() {
             // There is still a timing side channel here in that the code
-            // paths that send mail take noticeably longer than ones that
-            // don't. Add a randomized sleep to mitigate this somewhat.
-            use rand::{rngs::SmallRng, Rng, SeedableRng};
-            let mut rng = SmallRng::from_os_rng();
-            let delta: i32 = 100;
-            let sleep_ms = (1_000 + rng.random_range(-delta..=delta)) as u64;
+            // paths that send mail take noticeably longer than ones that don't.
+            // Add a randomized sleep to mitigate this somewhat.
+            use rand::{rngs::SmallRng, RngExt};
+            let mut rng: SmallRng = rand::make_rng();
+            let sleep_ms = rng.random_range(900..=1100) as u64;
             tokio::time::sleep(tokio::time::Duration::from_millis(sleep_ms)).await;
         } else {
             mail::send_register_verify_email(&data.email, &token).await?;