Milestone updates for 8.0

[IsakNaslundBh]

Issues addressed by this PR

• Freeze upgrades for 7.3
• Add new BHoMUpgrader for 8.0
• Add testsets for 7.3
• Uptick version to be tested in verification

Test files

Changelog

Additional comments

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @BHoMBot on BHoM

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-versioning result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @BHoMBot on BHoM_Engine

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @BHoMBot on SQL_Toolkit

[adecler]

Aligns with the changes described in our End of Milestone Procedure

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @BHoMBot on BHoMAnalytics_Toolkit

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @IsakNaslundBh on BHoM_Installer

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-versioning result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @IsakNaslundBh on Robot_Toolkit

[bhombot-ci]

@IsakNaslundBh just to let you know, I have provided a check-ready-to-merge result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @IsakNaslundBh on BHoM