Replace once_cell with stdlib

LazyLock isn't standardized yet, but OnceLock is good enough for what we
need.

Cargo.lock

@@ -347,7 +347,6 @@ dependencies = [
  "normpath",
  "nu-ansi-term",
  "num_cpus",
- "once_cell",
  "regex",
  "regex-syntax",
  "tempfile",

Cargo.toml

@@ -18,7 +18,7 @@ readme = "README.md"
 repository = "https://github.com/sharkdp/fd"
 version = "8.7.0"
 edition= "2021"
-rust-version = "1.67.0"
+rust-version = "1.70.0"
 
 [badges.appveyor]
 repository = "sharkdp/fd"
@@ -47,7 +47,6 @@ globset = "0.4"
 anyhow = "1.0"
 dirs-next = "2.0"
 normpath = "1.1.1"
-once_cell = "1.17.2"
 crossbeam-channel = "0.5.8"
 clap_complete = {version = "4.3.0", optional = true}
 faccess = "0.2.4"

src/dir_entry.rs

@@ -1,11 +1,10 @@
+use std::cell::OnceCell;
 use std::ffi::OsString;
 use std::fs::{FileType, Metadata};
 use std::path::{Path, PathBuf};
 
 use lscolors::{Colorable, LsColors, Style};
 
-use once_cell::unsync::OnceCell;
-
 use crate::config::Config;
 use crate::filesystem::strip_current_dir;
 

src/exec/mod.rs

@@ -9,11 +9,10 @@ use std::io;
 use std::iter;
 use std::path::{Component, Path, PathBuf, Prefix};
 use std::process::Stdio;
-use std::sync::Mutex;
+use std::sync::{Mutex, OnceLock};
 
 use anyhow::{bail, Result};
 use argmax::Command;
-use once_cell::sync::Lazy;
 use regex::Regex;
 
 use crate::exit_codes::{merge_exitcodes, ExitCode};
@@ -231,8 +230,7 @@ impl CommandTemplate {
         I: IntoIterator<Item = S>,
         S: AsRef<str>,
     {
-        static PLACEHOLDER_PATTERN: Lazy<Regex> =
-            Lazy::new(|| Regex::new(r"\{(/?\.?|//)\}").unwrap());
+        static PLACEHOLDER_PATTERN: OnceLock<Regex> = OnceLock::new();
 
         let mut args = Vec::new();
         let mut has_placeholder = false;
@@ -243,7 +241,10 @@ impl CommandTemplate {
             let mut tokens = Vec::new();
             let mut start = 0;
 
-            for placeholder in PLACEHOLDER_PATTERN.find_iter(arg) {
+            let pattern =
+                PLACEHOLDER_PATTERN.get_or_init(|| Regex::new(r"\{(/?\.?|//)\}").unwrap());
+
+            for placeholder in pattern.find_iter(arg) {
                 // Leading text before the placeholder.
                 if placeholder.start() > start {
                     tokens.push(Token::Text(arg[start..placeholder.start()].to_owned()));

src/filter/size.rs

@@ -1,9 +1,9 @@
+use std::sync::OnceLock;
+
 use anyhow::anyhow;
-use once_cell::sync::Lazy;
 use regex::Regex;
 
-static SIZE_CAPTURES: Lazy<Regex> =
-    Lazy::new(|| Regex::new(r"(?i)^([+-]?)(\d+)(b|[kmgt]i?b?)$").unwrap());
+static SIZE_CAPTURES: OnceLock<Regex> = OnceLock::new();
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum SizeFilter {
@@ -31,11 +31,13 @@ impl SizeFilter {
     }
 
     fn parse_opt(s: &str) -> Option<Self> {
-        if !SIZE_CAPTURES.is_match(s) {
+        let pattern =
+            SIZE_CAPTURES.get_or_init(|| Regex::new(r"(?i)^([+-]?)(\d+)(b|[kmgt]i?b?)$").unwrap());
+        if !pattern.is_match(s) {
             return None;
         }
 
-        let captures = SIZE_CAPTURES.captures(s)?;
+        let captures = pattern.captures(s)?;
         let limit_kind = captures.get(1).map_or("+", |m| m.as_str());
         let quantity = captures
             .get(2)