Remove pipenv install from Makefile (#299)

This removes the install of `pipenv` from the Makefile. Instead,
mandating that users should install it on their own system-wide.

In addition , it fixes the pyproject.toml to use the [new
metadata](https://ichard26.github.io/blog/2025/01/whats-new-in-pip-25.0/#key-features)
for `license-expression` and `license-file`.

Author: smaye81

.github/CONTRIBUTING.md

@@ -19,8 +19,12 @@ git clone [email protected]:bufbuild/protovalidate-python.git
 cd protovalidate-python
 ```
 
-Then, make any changes you'd like. We use a Makefile to test and lint our code,
-so you'll need a few non-Python tools:
+Next, install dependencies. You will need:
+
+* Python >=v3.9
+* [Pipenv](https://pipenv.pypa.io/en/latest/index.html)
+
+We use a Makefile to test and lint our code, so you'll also need a few non-Python tools:
 
 * GNU Make (to use the Makefile): part of the `build-essential` package on
   Debian-derived Linux distributions (including Ubuntu), and part of

.github/workflows/ci.yaml

@@ -32,6 +32,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          cache: "pipenv"
+      - run: ${{steps.python.outputs.python-path}}  -m pip install --upgrade pip pipenv
       - name: Execute tests
         run: make test PYTHON=${{ steps.python.outputs.python-path }}
       - name: Lint

.github/workflows/conformance.yaml

@@ -32,5 +32,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          cache: "pipenv"
+      - run: ${{steps.python.outputs.python-path}}  -m pip install --upgrade pip pipenv
       - name: Test conformance
         run: make conformance PYTHON=${{ steps.python.outputs.python-path }}

Makefile

@@ -62,7 +62,6 @@ lint: install ## Lint code
 
 .PHONY: install
 install: ## Install dependencies
-	$(PYTHON) -m pip install --upgrade pip pipenv
 	pipenv --python $(PYTHON) sync --dev
 
 .PHONY: checkgenerate

Pipfile

@@ -11,7 +11,7 @@ protobuf = "==6.*"
 pytest = "*"
 mypy = "*"
 ruff = "*"
-types-protobuf = "*"
+types-protobuf = "==6.30.2.20250503"
 exceptiongroup = "*"
 tomli = "*"
 

Pipfile.lock

@@ -6,7 +6,8 @@ build-backend = "hatchling.build"
 name = "protovalidate"
 description = "Protocol Buffer Validation for Python"
 readme = "README.md"
-license = { file = "LICENSE" }
+license-expression = "Apache 2.0"
+license-file = "LICENSE"
 keywords = ["validate", "protobuf", "protocol buffer"]
 requires-python = ">=3.9"
 classifiers = [
@@ -15,7 +16,6 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
-  "License :: OSI Approved :: Apache Software License",
   "Operating System :: OS Independent",
   "Typing :: Typed",
 ]