2024: d03: ex2: add solution

This is mostly about unused imports.

A couple errors remain, but are fine in my book (using `l` as a variable
name, assigning a lambda to a variable).

2024/d02/ex1/ex1.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
-import itertools
 import sys
+import itertools
 
 Report = list[int]
 

2024/d02/ex2/ex2.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
-import itertools
 import sys
+import itertools
 
 Report = list[int]
 

2024/d03/ex1/ex1.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python
 
-import dataclasses
-import re
 import sys
+import re
+import dataclasses
 
 
 @dataclasses.dataclass

2024/d03/ex2/ex2.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python
 
-import dataclasses
-import re
 import sys
+import re
+import dataclasses
 
 
 @dataclasses.dataclass

flake.nix

@@ -43,10 +43,6 @@
                 enable = true;
               };
 
-              ruff = {
-                enable = true;
-              };
-
               ruff-format = {
                 enable = true;
               };

ruff.toml

@@ -1,8 +0,0 @@
-[lint]
-extend-select = [
-    "I", # Import sorting is a lint check
-]
-ignore = [
-    "E731", # Assigning lambdas is sometimes more readable
-    "E741", # Ambiguous variable names are good enough actually
-]