Update MSRV to Rust 1.72 (#3595)

Required to update to puffin 0.18

crates/egui_plot/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.23.0"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
 description = "Immediate mode plotting for the egui GUI library"
 edition = "2021"
-rust-version = "1.70"
+rust-version = "1.72"
 homepage = "https://github.com/emilk/egui"
 license = "MIT OR Apache-2.0"
 readme = "README.md"

crates/egui_plot/src/items/mod.rs

@@ -1855,7 +1855,7 @@ where
         .into_iter()
         .enumerate()
         .map(|(index, bar)| {
-            let bar_rect: Rect = transform.rect_from_values(&bar.bounds_min(), &bar.bounds_max());
+            let bar_rect = transform.rect_from_values(&bar.bounds_min(), &bar.bounds_max());
             let dist_sq = bar_rect.distance_sq_to_pos(point);
 
             ClosestElem { index, dist_sq }

crates/egui_plot/src/items/values.rs

@@ -245,8 +245,7 @@ impl PlotPoints {
         (0..points)
             .map(|i| {
                 let t = start + i as f64 * increment;
-                let (x, y) = function(t);
-                [x, y]
+                function(t).into()
             })
             .collect()
     }

crates/egui_plot/src/lib.rs

@@ -1845,7 +1845,7 @@ impl PreparedPlot {
             return Vec::new();
         }
 
-        let interact_radius_sq: f32 = (16.0f32).powi(2);
+        let interact_radius_sq = (16.0_f32).powi(2);
 
         let candidates = items.iter().filter_map(|item| {
             let item = &**item;