Improve exclusion syntax to match exact files (#209)

resources/test/fixtures/directory/also_excluded.py

@@ -0,0 +1,9 @@
+a = "abc"
+b = f"ghi{'jkl'}"
+
+c = f"def"
+d = f"def" + "ghi"
+e = (
+    f"def" +
+    "ghi"
+)

resources/test/fixtures/pyproject.toml

@@ -1,6 +1,10 @@
 [tool.ruff]
 line-length = 88
-extend-exclude = ["excluded.py", "migrations"]
+extend-exclude = [
+    "excluded.py",
+    "migrations",
+    "./resources/test/fixtures/directory/also_excluded.py",
+]
 select = [
     "E402",
     "E501",