Fix type errors in calc_rectilinear_lon_edge and calc_rectilinear_lat_edge in grid.py #117

	---
	#
	# GitHub action to build the ReadTheDocs environment with micromamba
	# See: https://github.com/marketplace/actions/setup-micromamba
	#
	name: build-rtd-environment

	on:
	push:
	branches: [ "main", "dev", "dependabot/*" ]
	pull_request:
	# The branches below must be a subset of the branches above
	branches: [ "main", "dev" ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
	steps:
	- name: Checkout the GCPy repository
	uses: actions/checkout@v4
	- name: Create "rtd_env" environment
	uses: mamba-org/setup-micromamba@v1
	with:
	micromamba-version: 'latest'
	environment-file: docs/environment_files/read_the_docs_environment.yml
	init-shell: bash
	cache-environment: false
	generate-run-shell: true
	post-cleanup: 'all'
	- name: Get version numbers of packages
	run: \|
	python --version
	sphinx-autobuild --version
	shell: micromamba-shell {0}

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