Bumped version for next RC.

Reverted to SNAPSHOT suffix.

Merge pull request #771 from jmp/upgrade-asciidoctorj-to-v2.5.7

Fix java.lang.UnsatisfiedLinkError thrown on Apple M1

Added SDKMAN secrets.

Merge pull request #716 from jonbullock/release/2.7.0-rc.4

Updated version for 2.7.0-rc.4 release

Merge pull request #713 from jonbullock/release/2.7.0-rc.3

 Updated version for 2.7.0-rc.3 release

Merge pull request #703 from jonbullock/release/2.7.0-rc.2

Updated version for 2.7.0-rc.2 release

Merge pull request #701 from jonbullock/release/2.7.0-rc.1

Updated version for 2.7.0-rc.1 release

Merge pull request #695 from jonbullock/release/2.6.7

Release v2.6.7

Merge pull request #674 from jonbullock/master

Resolve merge conflict for #672