ci: upgrade versions of tools used in the Github Actions workflows #225

Job	Run time
run-guard	1s
test-documentation (3.8)	18s
test-source-code (ubuntu-latest, 3.6)	4m 7s
test-source-code (ubuntu-latest, 3.7)	1m 32s
test-source-code (ubuntu-latest, 3.8)	1m 46s
test-source-code (ubuntu-latest, 3.9)	1m 24s
test-source-code (ubuntu-latest, 3.10)	54s
test-source-code (ubuntu-latest, 3.11)	1m 3s
test-source-code (ubuntu-latest, 3.12)	2m 13s
test-source-code (windows-latest, 3.6)	1m 31s
test-source-code (windows-latest, 3.7)	59s
test-source-code (windows-latest, 3.8)	1m 0s
test-source-code (windows-latest, 3.9)	51s
test-source-code (windows-latest, 3.10)	59s
test-source-code (windows-latest, 3.11)	1m 16s
test-source-code (windows-latest, 3.12)	2m 47s
test-source-code (macos-latest, 3.6)	1m 10s
test-source-code (macos-latest, 3.7)	1m 15s
test-source-code (macos-latest, 3.8)	54s
test-source-code (macos-latest, 3.9)	56s
test-source-code (macos-latest, 3.10)	58s
test-source-code (macos-latest, 3.11)	1m 19s
test-source-code (macos-latest, 3.12)	2m 2s
test-source-code (2.7, ubuntu-latest)	2m 31s
	33m 46s

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