Address beta warnings

Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 
 members = [
   "glean-core",

glean-core/src/database/mod.rs

@@ -1080,7 +1080,7 @@ mod test {
         let metric_id_pattern = "telemetry_test.single_metric";
 
         // Write sample metrics to the database.
-        let lifetimes = vec![Lifetime::User, Lifetime::Ping, Lifetime::Application];
+        let lifetimes = [Lifetime::User, Lifetime::Ping, Lifetime::Application];
 
         for lifetime in lifetimes.iter() {
             for value in &["retain", "delete"] {

glean-core/src/event_database/mod.rs

@@ -894,7 +894,7 @@ mod test {
             },
             execution_counter: None,
         };
-        let timestamps = vec![20, 40, 200];
+        let timestamps = [20, 40, 200];
         let not_glean_restarted = StoredEvent {
             event: RecordedEvent {
                 timestamp: timestamps[0],
@@ -970,8 +970,8 @@ mod test {
 
         // This scenario represents a run of three events followed by an hour between runs,
         // followed by one final event.
-        let timestamps = vec![20, 40, 200, 12];
-        let ecs = vec![0, 1];
+        let timestamps = [20, 40, 200, 12];
+        let ecs = [0, 1];
         let some_hour = 16;
         let startup_date = FixedOffset::east(0)
             .ymd(2022, 11, 24)
@@ -1095,8 +1095,8 @@ mod test {
 
         // This scenario represents a run of two events followed by negative one hours between runs,
         // followed by two more events.
-        let timestamps = vec![20, 40, 12, 200];
-        let ecs = vec![0, 1];
+        let timestamps = [20, 40, 12, 200];
+        let ecs = [0, 1];
         let some_hour = 10;
         let startup_date = FixedOffset::east(0)
             .ymd(2022, 11, 25)

glean-core/tests/event.rs

@@ -136,7 +136,7 @@ fn snapshot_correctly_clears_the_stores() {
     let snapshot2 = glean
         .event_storage()
         .snapshot_as_json(&glean, "store2", false);
-    for s in vec![snapshot, snapshot2] {
+    for s in [snapshot, snapshot2] {
         assert!(s.is_some());
         let s = s.unwrap();
         assert_eq!(1, s.as_array().unwrap().len());