Update python to version v279 #1617

Job	Run time
build.20-true	3m 47s
build.20-true	14m 35s
build.20-true	14m 11s
build.20-true	14m 28s
build.20-true	14m 6s
build.22-true	3m 17s
build.22-true	14m 2s
build.22-true	13m 40s
build.22-true	13m 56s
build.22-true	13m 32s
build.24-true	3m 46s
build.24-true	14m 34s
build.24-true	14m 11s
build.24-true	14m 26s
build.24-true	14m 3s
build.20-false	3m 34s
build.20-false	4m 39s
build.20-false	4m 39s
build.20-false	4m 39s
build.20-false	4m 39s
build.22-false	3m 33s
build.22-false	4m 12s
build.22-false	4m 12s
build.22-false	4m 12s
build.22-false	4m 12s
build.24-false	3m 35s
build.24-false	4m 7s
build.24-false	4m 7s
build.24-false	4m 7s
build.24-false	4m 7s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
	4h 3m 8s

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