[maven-release-plugin] copy for tag 1.15

[maven-release-plugin] copy for tag 1.14

[maven-release-plugin] copy for tag 1.13

[maven-release-plugin] prepare release sslr-1.12

[maven-release-plugin] prepare release sslr-1.11

[maven-release-plugin] prepare release sslr-1.10

[maven-release-plugin] prepare release sslr-1.9

[maven-release-plugin] prepare release sslr-1.8