It hasn't been in use for SecurityPolicy None

Fixed a function signature of `read_array_dimensions` in asyncua/common/node.

ArrayDimentions is always a list of ints because OPC UA has support for multidimentional arrays. But the return type was is specified as int.

This way we can decorate a function which is already decorated with
`@uamethod` again and things like `func.__name__` will correctly return
the name of the decorated function and not `wrapper`.

This reverts commit f22bac28.

* Add server-side session watchdog

* Add test

* Remove whitespace

* Move watchdog to uaprocessor

* Restore import order

* Resolve timezone deprecation warnings

* Update uaprotocol_auto

* Fix epoch to UTC

* More UTC fixes

* Require newer cryptography

Since not_valid_before_utc and not_valid_after_utc were added

* Fix import

* Fix tz in test_datetime

* Fix ruff check

* One more import

* Include timezone in env

* Fix typo

Bumps [pypa/gh-action-pypi-publish](https://github.com/pypa/gh-action-pypi-publish) from 1.8.14 to 1.9.0.
- [Release notes](https://github.com/pypa/gh-action-pypi-publish/releases)
- [Commits](https://github.com/pypa/gh-action-pypi-publish/compare/81e9d935c883d0b210363ab89cf05f3894778450...ec4db0b4ddc65acdf4bff5fa45ac92d78b56bdf0)

---
updated-dependencies:
- dependency-name: pypa/gh-action-pypi-publish
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>

* Add callback to delete subscriptions

* Improve docstring

* Don't shadow CancelledError

* Simplify subscription storage

* Make it safe to iterate over keys

* Restore accidentally deleted line

* Remove task context

* Remove list

* Fix subscriptions for sessions

Fix SecurityPolicyType docstring: e.g. "None" -> "NoSecurity"
Reorganize imports and better align code to pep standards (ruff)