Added Pylint to requirements-dev.txt (#5697)

**Context:**
Pylint was missing from the `requirements-dev.txt` despite being needed
for the CI pipeline and pre-commit.

**Description of the Change:**
Added `pylint==2.7.4`, mirroring the version used in the CI pipeline.

[[sc-63430](https://app.shortcut.com/xanaduai/story/63430/)]

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Co-authored-by: Thomas R. Bromley <49409390+trbromley@users.noreply.github.com>

requirements-dev.txt

@@ -9,3 +9,4 @@ pytest-benchmark
 black>=21
 tomli~=2.0.0 # Drop once minimum Python version is 3.11
 isort==5.13.2
+pylint==2.7.4