chore: Replace hardcoded version of Pip Tools in Make variable

In `Makefile`, obtain the version of `pip-tools` from
Python dependency manifests instead of hardcoding it in `Makefile`.

This change avoids having to update the version of that package in
multiple places (`requirements.*` and `Makefile`).

Author: jtrobles-cdd

Makefile

@@ -10,7 +10,10 @@ PYTHON_PIP_VERSION_SPECIFIER = ==24.2
 PYTHON_SETUPTOOLS_VERSION_SPECIFIER = ==75.8.2
 PYTHON_WHEEL_VERSION_SPECIFIER = ==0.45.1
 PYTHON_VIRTUALENV_DIR = .pyenv
-PYTHON_PIP_TOOLS_VERSION_SPECIFIER = ==7.4.1
+PYTHON_PIP_TOOLS_VERSION_SPECIFIER = $(shell \
+	grep -E '^pip-tools==.+' --no-filename --only-matching --no-messages -- requirements{,-dev}.{txt,in} \
+	| head -n 1 | sed 's/^pip-tools//' \
+)
 PYTHON_PIP_TOOLS_SRC_FILES = requirements.in requirements-dev.in
 
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