Update version to 7.0.0

What's Changed

• Set SysFileController as public in Services.yaml by @sfroemkenjw in #71
• Replace extkey for deprecated TER repo by @sfroemkenjw in #72
• Typo3 12 compatibility #74

Full Changelog: 6.0.6...7.0.0

3.2.1

• Fix Indexing failing with error "Index config for xxx not found"

2.1.4

Fixed deprication warnings with solr 8.1.x

2.1.3

Reworked index queue creation

2.1.2

Version 2.1.2

Fixed bug with flushIndexQueue

2.1.1

Added param to solr command controller createIndexQueueForAllSites to
flush the current queue

2.1.0

Version 2.1.0

Added feature to create solr index queue for all sites via command
controller

2.0.0

[Breaking] Dropped support for ext-solr older than 8.1.x