[JENKINS-64439] "positive-number" field validator accepts non valid java numbers

Replaced deprecated IOUtils.LINE_SEPARATOR with System.lineSeparator()

Minor spotbugs issues

[JENKINS-58101] Cache blockage reasons when considering parked executors

Code cleanup

Prevent user to input 'e' or 'E'.
Except 'positive-number', I also add the restriction to 'non-negative-number' and 'number'

Bumps [jnr-posix](https://github.com/jnr/jnr-posix) from 3.0.45 to 3.1.4.
- [Release notes](https://github.com/jnr/jnr-posix/releases)
- [Commits](https://github.com/jnr/jnr-posix/compare/jnr-posix-3.0.45...jnr-posix-3.1.4)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [jna](https://github.com/java-native-access/jna) from 5.3.1 to 5.6.0.
- [Release notes](https://github.com/java-native-access/jna/releases)
- [Changelog](https://github.com/java-native-access/jna/blob/master/CHANGES.md)
- [Commits](https://github.com/java-native-access/jna/compare/5.3.1...5.6.0)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Fix broken 'download Maven here' link

* [JENKINS-63833] Make the groovy script source customizable

* [JENKINS-63833] Make the groovy script root directory customizable

* Apply suggestions from code review
Co-authored-by: NDaniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: NDaniel Beck <1831569+daniel-beck@users.noreply.github.com>

[JENKINS-64483] Hide collapse link if it isn't possible

* Stapler with no illegal access warnings

* Use incremental

* Update bom/pom.xml
Co-authored-by: NJesse Glick <jglick@cloudbees.com>

* Update bom/pom.xml

* Update bom/pom.xml
Co-authored-by: NJesse Glick <jglick@cloudbees.com>

- Uses the window.requestAnimationFrame to throttle callback calls through the raf polyfill

Do not show an empty tooltip on svg icons

If `Jenkins#setSecurityRealm` is called concurrently from multiple threads there is a
potential race condition on the authentication filters registration.

`Jenkins#setSecurityRealm` calls `filter.reset()`, `HudsonFilter#reset` is not
synchronized however it is replacing the old filter with the new filter (if there was one)
 which is not a thread safe operation.

The effect of this race condition is the wrong auth filter being registered.

Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: NRaihaan Shouhell <raihaanhimself@gmail.com>