CI: recreate conda env from conda-forge to avoid mixed-channel solve #4034

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	26m 47s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	29m 10s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	16m 21s
test-arm / test-backend-macos	0s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	17m 23s
test-arm / package-golden-artifacts	45s
	1h 30m 26s

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