Bump the php-prod group across 1 directory with 4 updates

Bumps the php-prod group with 4 updates in the / directory: [doctrine/doctrine-bundle](https://github.com/doctrine/DoctrineBundle), [doctrine/orm](https://github.com/doctrine/orm), [nelmio/security-bundle](https://github.com/nelmio/NelmioSecurityBundle) and [pagerfanta/pagerfanta](https://github.com/BabDev/Pagerfanta).


Updates `doctrine/doctrine-bundle` from 2.18.1 to 2.18.2
- [Release notes](https://github.com/doctrine/DoctrineBundle/releases)
- [Commits](doctrine/DoctrineBundle@2.18.1...2.18.2)

Updates `doctrine/orm` from 3.5.8 to 3.6.1
- [Release notes](https://github.com/doctrine/orm/releases)
- [Commits](doctrine/orm@3.5.8...3.6.1)

Updates `nelmio/security-bundle` from 3.6.0 to 3.8.0
- [Release notes](https://github.com/nelmio/NelmioSecurityBundle/releases)
- [Changelog](https://github.com/nelmio/NelmioSecurityBundle/blob/master/CHANGELOG.md)
- [Commits](nelmio/NelmioSecurityBundle@v3.6.0...v3.8.0)

Updates `pagerfanta/pagerfanta` from 4.7.2 to 4.8.0
- [Changelog](https://github.com/BabDev/Pagerfanta/blob/4.x/CHANGELOG.md)
- [Commits](BabDev/Pagerfanta@v4.7.2...v4.8.0)

---
updated-dependencies:
- dependency-name: doctrine/doctrine-bundle
  dependency-version: 2.18.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: php-prod
- dependency-name: doctrine/orm
  dependency-version: 3.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: php-prod
- dependency-name: nelmio/security-bundle
  dependency-version: 3.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: php-prod
- dependency-name: pagerfanta/pagerfanta
  dependency-version: 4.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: php-prod
...

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Author: dependabot[bot]