data,apt/release,distro_info,new: replace lazy_static with LazyLock

Unify the lazily-initialized statics on std::sync::LazyLock, which the
newer code already uses: the embed_data! macro expands to a plain
static now, which also removes the visibility-forwarding workaround the
lazy_static! matcher forced on it (the @expand arm wrapping vis in
parentheses), and the 'static ref' spelling is kept at the call sites.
distro_info's HTTP client, the apt keyring cache and the new-template
registry follow the same pattern.

src/distro_info.rs

@@ -1,10 +1,10 @@
 use crate::data::embed_data;
 use chrono::NaiveDate;
-use lazy_static::lazy_static;
 use serde::Deserialize;
 use std::collections::HashMap;
 use std::error::Error;
 use std::path::Path;
+use std::sync::LazyLock;
 use std::time::Duration;
 
 #[derive(Debug, Clone)]
@@ -104,20 +104,20 @@ embed_data! {
     static ref DATA: Data = "../data/distro_info.yml"
 }
 
-lazy_static! {
-    // Shared HTTP client used for all outgoing plain requests: timeouts keep
-    // a hanging remote (connect or transfer) from stalling pkh indefinitely.
-    // The short pool idle timeout and TCP keepalive avoid reusing keep-alive
-    // connections that the remote closed in the meantime, which surfaces as
-    // spurious 'error sending request' failures on busy mirrors/CDNs.
-    static ref HTTP_CLIENT: reqwest::Client = reqwest::Client::builder()
+// Shared HTTP client used for all outgoing plain requests: timeouts keep
+// a hanging remote (connect or transfer) from stalling pkh indefinitely.
+// The short pool idle timeout and TCP keepalive avoid reusing keep-alive
+// connections that the remote closed in the meantime, which surfaces as
+// spurious 'error sending request' failures on busy mirrors/CDNs.
+static HTTP_CLIENT: LazyLock<reqwest::Client> = LazyLock::new(|| {
+    reqwest::Client::builder()
         .connect_timeout(Duration::from_secs(10))
         .timeout(Duration::from_secs(30))
         .pool_idle_timeout(Duration::from_secs(10))
         .tcp_keepalive(Duration::from_secs(30))
         .build()
-        .expect("building the shared HTTP client with static options cannot fail");
-}
+        .expect("building the shared HTTP client with static options cannot fail")
+});
 
 /// Shared HTTP client with a connect timeout (10s) and a total request
 /// timeout (30s), to be used for all outgoing plain HTTP(S) requests