[maven-release-plugin] copy for tag checkstyle-8.18

[maven-release-plugin] copy for tag checkstyle-8.17

[maven-release-plugin] copy for tag checkstyle-8.16

[maven-release-plugin] copy for tag checkstyle-8.15

[maven-release-plugin] copy for tag checkstyle-8.14

[maven-release-plugin] copy for tag checkstyle-8.13

[maven-release-plugin] copy for tag checkstyle-8.12

[maven-release-plugin] copy for tag checkstyle-8.11

Issue checkstyle#3332: Added 'optgroup' HTML tag

Issue checkstyle#3332: Added 'optgroup' HTML tag