Bump checkstyle from 6.19 to 8.18

Created by: dependabot[bot]

Bumps checkstyle from 6.19 to 8.18.

Release notes

Sourced from checkstyle's releases.

checkstyle-8.18

https://checkstyle.org/releasenotes.html#Release_8.18

checkstyle-8.17

https://checkstyle.org/releasenotes.html#Release_8.17

checkstyle-8.16

https://checkstyle.org/releasenotes.html#Release_8.16

checkstyle-8.15

https://checkstyle.org/releasenotes.html#Release_8.15

checkstyle-8.14

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.14

checkstyle-8.13

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.13

checkstyle-8.12

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.12

checkstyle-8.11

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.11

checkstyle-8.10.1

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.10.1

checkstyle-8.10

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.10

checkstyle-8.9

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.9

checkstyle-8.8

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.8

Maven artifacts: http://repo1.maven.org/maven2/com/puppycrawl/tools/checkstyle/8.8/

checkstyle-8.7

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.7

checkstyle-8.6

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.6

checkstyle-8.5

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.5

checkstyle-8.4

http://checkstyle.sourceforge.net/releasenotes.html#Release_8.4

... (truncated)

Commits

• 252d29b [maven-release-plugin] prepare release checkstyle-8.18
• 385b64a minor: fix typo in comment
• e77ec1c doc: add releasenotes 8.18
• 180b4fe Issue #6474: disable external dtd load by default
• 59413ca minor: changed powermock tests to normal tests for TranslationCheck
• 906adae Issue #4814: added try/catch to setting up TreeWalker children
• 4b8e508 minor: changed powermock tests to normal tests
• 86dcb80 Issue #6439: move powermock tests away from the normal tests
• 96385e2 Issue #6440: AnnotationLocation: named parameters must be considered parameters
• 404143c Issue #6301: ArrayTypeStyle support for method definitions
• Additional commits viewable in compare view

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