Correctly use homebrew cache in macos-13 workflow #123

Job	Run time
Test PyMEOS - Python 3.8 on ubuntu-latest	57s
Test PyMEOS - Python 3.8 on macos-13	5m 38s
Test PyMEOS - Python 3.8 on macos-14	1m 50s
Test PyMEOS - Python 3.9 on ubuntu-latest	1m 0s
Test PyMEOS - Python 3.9 on macos-13	2m 58s
Test PyMEOS - Python 3.9 on macos-14	1m 21s
Test PyMEOS - Python 3.10 on ubuntu-latest	1m 2s
Test PyMEOS - Python 3.10 on macos-13	3m 41s
Test PyMEOS - Python 3.10 on macos-14	1m 19s
Test PyMEOS - Python 3.11 on ubuntu-latest	1m 2s
Test PyMEOS - Python 3.11 on macos-13	4m 52s
Test PyMEOS - Python 3.11 on macos-14	1m 24s
Test PyMEOS - Python 3.12 on ubuntu-latest	1m 6s
Test PyMEOS - Python 3.12 on macos-13	4m 37s
Test PyMEOS - Python 3.12 on macos-14	1m 20s
	34m 7s

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