Replace FileResource.is_binary with an encoding field #3660

Job	Run time
checks / docs	1m 5s
checks / readme-snippets	15s
checks / pre-commit	1m 3s
checks / test (3.10, locked, windows-latest)	2m 2s
checks / test (3.11, lowest-direct, windows-latest)	1m 54s
checks / test (3.11, locked, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.11, locked, windows-latest)	1m 58s
checks / test (3.12, lowest-direct, windows-latest)	2m 2s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.10, locked, ubuntu-latest)	1m 26s
checks / test (3.13, lowest-direct, windows-latest)	1m 51s
checks / test (3.12, locked, ubuntu-latest)	1m 44s
checks / test (3.13, locked, windows-latest)	1m 45s
checks / test (3.12, locked, windows-latest)	2m 2s
checks / test (3.14, locked, windows-latest)	1m 59s
checks / test (3.14, locked, ubuntu-latest)	1m 22s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.10, lowest-direct, windows-latest)	1m 52s
checks / test (3.14, lowest-direct, windows-latest)	2m 7s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.13, locked, ubuntu-latest)	1m 21s
all-green	5s
	36m 5s

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