Fix/update a few Rust examples:

* `counter`
* `hello`
* `performance_counters`
* `periodic_tasks`
* `pub-sub`
* `qrcode`

rust/counter/Cargo.toml

@@ -1,14 +1,12 @@
 [package]
-name = "counter"
-version = "1.0.0"
 edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+name = "counter"
+version = "1.1.0"
 
 [lib]
 crate-type = ["cdylib"]
 
 [dependencies]
-candid = "0.7.14"
-ic-cdk = "0.5.2"
-ic-cdk-macros = "0.5.2"
+candid = "0.10"
+ic-cdk = "0.12"
+ic-cdk-macros = "0.8"

rust/counter/counter.did

@@ -1,5 +1,5 @@
 service : {
-    "get": ()    -> (nat) query;
-    "set": (nat) -> ();
-    "inc": ()    -> ();
-}
+    "get" : () -> (nat) query;
+    "set" : (nat) -> ();
+    "inc" : () -> ();
+};

rust/counter/dfx.json

@@ -12,11 +12,5 @@
       "packtool": ""
     }
   },
-  "networks": {
-    "local": {
-      "bind": "127.0.0.1:8000",
-      "type": "ephemeral"
-    }
-  },
   "version": 1
 }

rust/counter/src/lib.rs

@@ -1,8 +1,8 @@
-use std::cell::RefCell;
 use candid::types::number::Nat;
+use std::cell::RefCell;
 
 thread_local! {
-    static COUNTER: RefCell<Nat> = RefCell::new(Nat::from(0));
+    static COUNTER: RefCell<Nat> = RefCell::new(Nat::from(0_u32));
 }
 
 /// Get the value of the counter.
@@ -21,11 +21,9 @@ fn set(n: Nat) {
 /// Increment the value of the counter.
 #[ic_cdk_macros::update]
 fn inc() {
-    COUNTER.with(|counter| *counter.borrow_mut() += 1);
+    COUNTER.with(|counter| *counter.borrow_mut() += 1_u32);
 }
 
-
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -49,4 +47,4 @@ mod tests {
             assert_eq!(get(), Nat::from(i));
         }
     }
-}
+}