Fix spelling errors

Used config files:
    1: .codespellrc

-------8<-------
SUMMARY:
atleast       2
debhlper      1
ser           1
socio-economic1
unuseful      1

CODE_OF_CONDUCT.md

@@ -6,7 +6,7 @@ In the interest of fostering an open and welcoming environment, we as
 contributors and maintainers pledge to making participation in our project and
 our community a harassment-free experience for everyone, regardless of age, body
 size, disability, ethnicity, sex characteristics, gender identity and expression,
-level of experience, education, socio-economic status, nationality, personal
+level of experience, education, socioeconomic status, nationality, personal
 appearance, race, religion, or sexual identity and orientation.
 
 ## Our Standards

src/common.rs

@@ -1835,7 +1835,7 @@ lazy_static::lazy_static! {
         |m| Ok(Some(Box::new(MissingPkgConfig::simple(m.get(1).unwrap().as_str().to_string()))))
     ),
     regex_line_matcher!(
-        r"\*\*\* Please install (.*) \(atleast version (.*)\) or adjust",
+        r"\*\*\* Please install (.*) \(at least version (.*)\) or adjust",
         |m| Ok(Some(Box::new(MissingPkgConfig{
             module: m.get(1).unwrap().as_str().to_string(),
             minimum_version: Some(m.get(2).unwrap().as_str().to_string())
@@ -5121,7 +5121,7 @@ Call Stack (most recent call first):
             vec![
                 "checking for pkg-config... no",
                 "",
-                "*** Your version of pkg-config is too old. You need atleast",
+                "*** Your version of pkg-config is too old. You need at least",
                 "*** pkg-config 0.9.0 or newer. You can download pkg-config",
                 "*** from the freedesktop.org software repository at",
                 "***",

src/problems/common.rs

@@ -1382,7 +1382,7 @@ impl Display for UnsupportedDebhelperCompatLevel {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         write!(
             f,
-            "Request debhlper compat level {} lower than supported {}",
+            "Request debhelper compat level {} lower than supported {}",
             self.requested, self.oldest_supported
         )
     }

src/sbuild.rs

@@ -9,7 +9,7 @@ use crate::problems::common::{ChrootNotFound, NoSpaceOnDevice, PatchApplicationF
 use crate::problems::debian::*;
 use crate::{Match, Problem, SingleLineMatch};
 use debversion::Version;
-use serde::ser::{Serialize, SerializeStruct, Serializer};
+use serde::set::{Serialize, SerializeStruct, Serializer};
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::{BufRead, BufReader};
@@ -687,7 +687,7 @@ pub fn strip_build_tail<'a>(
 
     let mut interesting_lines: &'_ [&'a str] = lines;
 
-    // Strip off unuseful tail
+    // Strip off useless tail
     for (i, line) in lines.enumerate_tail_forward(look_back) {
         if line.starts_with("Build finished at ") {
             interesting_lines = &lines[..i];