Fix infinite recursion on Windows (Sourcery refactored)

[sourcery-ai]

Pull Request #137 refactored by Sourcery.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it.

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   the original Pull Request

   Incorporate changes via command line

   git fetch https://github.com/henriquebastos/python-decouple pull/137/head
   git merge --ff-only FETCH_HEAD
   git push

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[sourcery-ai]

Function strtobool refactored with the following changes:

• Use f-string instead of string concatenation (use-fstring-for-concatenation)

[sourcery-ai]

Function Config._cast_boolean refactored with the following changes:

• Swap if/else branches of if expression to remove negation (swap-if-expression)
• Replaces an empty collection equality with a boolean operation (simplify-empty-collection-comparison)

[sourcery-ai]

Function Config.get refactored with the following changes:

• Merge else clause's nested if statement into elif (merge-else-if-into-elif)
• Lift code into else after jump in control flow (reintroduce-else)
• Replace call to format with f-string (use-fstring-for-formatting)

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.45%.

Quality metrics	Before	After	Change
Complexity	1.86 ⭐	1.73 ⭐	-0.13 👍
Method Length	40.66 ⭐	41.07 ⭐	0.41 👎
Working memory	5.46 ⭐	5.30 ⭐	-0.16 👍
Quality	84.47% ⭐	84.92% ⭐	0.45% 👍

Other metrics	Before	After	Change
Lines	296	307	11

Changed files	Quality Before	Quality After	Quality Change
decouple.py	82.34% ⭐	82.59% ⭐	0.25% 👍
tests/test_autoconfig.py	88.93% ⭐	89.34% ⭐	0.41% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
decouple.py	RepositoryEnv.__init__	10 🙂	114 🙂	11 😞	55.54% 🙂	Extract out complex expressions
decouple.py	Config.get	6 ⭐	80 🙂	10 😞	65.92% 🙂	Extract out complex expressions
decouple.py	Csv.__init__	0 ⭐	42 ⭐	10 😞	77.78% ⭐	Extract out complex expressions

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