Update release checklist: macOS/Linux artifact is called 'wheels'

[hugovk]

Noticed during #7348, helps #7390.

Windows

The Windows instructions are correct, it's artifact is "dist-x.y.z":

Pillow/.github/workflows/test-windows.yml

Line 233 in 0be67e5

for /f "tokens=3 delims=/" %%a in ("${{ github.ref }}") do echo dist=dist-%%a >> %GITHUB_OUTPUT%

Pillow/.github/workflows/test-windows.yml

Lines 238 to 243 in 0be67e5

	- name: Upload wheel
	uses: actions/upload-artifact@v3
	if: "github.event_name != 'pull_request'"
	with:
	name: ${{ steps.wheel.outputs.dist }}
	path: "*.whl"

• dist-10.1.0 https://github.com/python-pillow/Pillow/actions/runs/6523153069

macOS/Linux

But macOS/Linux is simply "wheels":

Pillow/.github/workflows/wheels.yml

Lines 25 to 27 in 0be67e5

	uses: ./.github/workflows/wheels-macos.yml
	with:
	artifacts-name: "wheels"

Pillow/.github/workflows/wheels.yml

Lines 30 to 32 in 0be67e5

	uses: ./.github/workflows/wheels-linux.yml
	with:
	artifacts-name: "wheels"

Pillow/.github/workflows/wheels-linux.yml

Lines 62 to 65 in 0be67e5

	- uses: actions/upload-artifact@v3
	with:
	name: ${{ inputs.artifacts-name }}
	path: wheelhouse/*.whl

Pillow/.github/workflows/wheels-macos.yml

Lines 50 to 53 in 0be67e5

	- uses: actions/upload-artifact@v3
	with:
	name: ${{ inputs.artifacts-name }}
	path: wheelhouse/*.whl

• wheels https://github.com/python-pillow/Pillow/actions/runs/6523153075