fix: use MAX/MIN instead of the deprecated max_value()/min_value()

[shinaoka]

The lint job, and so main, is red on four clippy errors that have nothing to do with any recent change:

error: use of deprecated associated function core::num::<impl u16>::max_value
  --> hdf5/src/hl/filters.rs:477:47
error: use of deprecated associated function core::num::<impl u8>::max_value
  --> hdf5/src/hl/filters.rs:484:46
error: use of deprecated associated function core::num::<impl u64>::max_value
  --> hdf5/src/hl/plist/file_access.rs:358:22
error: use of deprecated associated function core::num::<impl u64>::max_value
  --> hdf5/src/hl/plist/file_access.rs:424:42

max_value()/min_value() become MAX/MIN. No behaviour change; cargo clippy --lib is clean with the current stable toolchain.

This blocks every pull request, since lint is a required check, so it is split out rather than folded into an unrelated change.