exercises(all-your-base): three tests are broken because they do not free the returned memory

[FedericoStra]

In contrast to all other tests, these three forget to call defer testing.allocator.free(actual);:

zig/exercises/practice/all-your-base/test_all_your_base.zig

Lines 88 to 113 in f274768

	test "empty list" {
	const expected = [_]u32{0};
	const digits = [_]u32{};
	const input_base = 2;
	const output_base = 10;
	const actual = try convert(testing.allocator, &digits, input_base, output_base);
	try testing.expectEqualSlices(u32, &expected, actual);
	}
	test "single zero" {
	const expected = [_]u32{0};
	const digits = [_]u32{0};
	const input_base = 10;
	const output_base = 2;
	const actual = try convert(testing.allocator, &digits, input_base, output_base);
	try testing.expectEqualSlices(u32, &expected, actual);
	}
	test "multiple zeros" {
	const expected = [_]u32{0};
	const digits = [_]u32{ 0, 0, 0 };
	const input_base = 10;
	const output_base = 2;
	const actual = try convert(testing.allocator, &digits, input_base, output_base);
	try testing.expectEqualSlices(u32, &expected, actual);
	}

This forces the solution to return a slice always referencing the same global array, which is incorrect because it can be modified hence cannot be guaranteed to be zero.

See for instance these solutions: mine, stgatilov, sezoka.

Some other solutions are even more broken because they return a slice referencing a local array (hence UB): Acaccia, mhennig4711.

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