Fix linter warnings in recent Rust versions (#181)

## Description

This PR fixes warnings generated by the following lints that were
upgraded in recent Rust versions:

-
[`static_mut_refs`](https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html)
-
[`clippy::needless_lifetimes`](https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes)

src/data_type.rs

@@ -393,8 +393,13 @@ macro_rules! data_type {
                 // PANIC: Value must fit into `usize` to allow indexing.
                 let index = usize::try_from(open62541_sys::$index).unwrap();
                 // SAFETY: We use this static variable only read-only.
+                // This was unsafe only before Rust 1.82.
+                // <https://blog.rust-lang.org/2024/10/17/Rust-1.82.0.html#safely-addressing-unsafe-statics>
+                #[allow(unused_unsafe)]
+                let ua_types = unsafe { std::ptr::addr_of!(open62541_sys::UA_TYPES) };
+                // SAFETY: Pointer is non-zero, aligned, correct type.
                 // PANIC: The given index is valid within `UA_TYPES`.
-                unsafe { open62541_sys::UA_TYPES.get(index) }.unwrap()
+                unsafe { (*ua_types).get(index) }.unwrap()
             }
 
             #[must_use]

src/server/access_control.rs

@@ -74,7 +74,7 @@ impl<'a> DefaultAccessControl<'a> {
 }
 
 // SAFETY: `UA_AccessControl_default()` replaces previously set config.
-unsafe impl<'a> AccessControl for DefaultAccessControl<'a> {
+unsafe impl AccessControl for DefaultAccessControl<'_> {
     type Sentinel = ();
 
     unsafe fn apply(self, config: &mut UA_ServerConfig) -> Result<Self::Sentinel> {

src/ua/data_types/node_id.rs

@@ -194,7 +194,7 @@ mod serde {
 
     struct NodeIdVisitor;
 
-    impl<'de> serde::de::Visitor<'de> for NodeIdVisitor {
+    impl serde::de::Visitor<'_> for NodeIdVisitor {
         type Value = NodeId;
 
         fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {