Bump symfony/framework-bundle from 3.4.15 to 3.4.26

Bumps [symfony/framework-bundle](https://github.com/symfony/framework-bundle) from 3.4.15 to 3.4.26.
- [Release notes](https://github.com/symfony/framework-bundle/releases)
- [Changelog](https://github.com/symfony/framework-bundle/blob/5.x/CHANGELOG.md)
- [Commits](symfony/framework-bundle@v3.4.15...v3.4.26)

Signed-off-by: dependabot[bot] <[email protected]>