Fix issues identified by codespell 2.2.1 and update ignored words

and also fix spelling in test/lint/lint-locale-dependence.py not caught by the
spelling linter and fix up a paragraph we are touching here in test/README.md.

test/lint/lint-locale-dependence.py

@@ -250,7 +250,7 @@ def main():
             exit_code = 1
 
     if exit_code == 1:
-        print("Unnecessary locale depedence can cause bugs that are very tricky to isolate and fix. Please avoid using locale dependent functions if possible.\n")
+        print("Unnecessary locale dependence can cause bugs that are very tricky to isolate and fix. Please avoid using locale-dependent functions if possible.\n")
         print(f"Advice not applicable in this specific case? Add an exception by updating the ignore list in {sys.argv[0]}")
 
     sys.exit(exit_code)

test/lint/spelling.ignore-words.txt

@@ -1,21 +1,23 @@
 asend
 ba
 blockin
+bu
 cachable
-creat
-desig
+clen
 fo
 fpr
 hights
-hist
-inout
+inflight
 invokable
 keypair
 mor
 nd
 nin
 ser
+siz
+stap
 unparseable
 unser
 useable
+warmup
 wit