Update dependency org.jenkins-ci.plugins:mailer to v515

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.jenkins-ci.plugins:mailer	509.vc54d23fc427e -> 515.vd788654779b_1

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Release Notes

jenkinsci/mailer-plugin (org.jenkins-ci.plugins:mailer)

v515.vd788654779b_1

Compare Source

👷 Changes for plugin developers

• Migrate from Commons Lang to native Java Platform functionality (#​379) @​basil

👻 Maintenance

• Migrate from Commons Lang to native Java Platform functionality (#​379) @​basil

📦 Dependency updates

• Upgrade Mock JavaMail (#​375) @​basil
• Bump io.jenkins.tools.bom:bom-2.504.x from 4710.v016f0a_07e34d to 5015.vb_52d36583443 (#​374) @​dependabot[bot]
• Bump io.jenkins.tools.incrementals:git-changelist-maven-extension from 1.8 to 1.10 (#​373) @​dependabot[bot]
• Bump org.jenkins-ci.plugins:plugin from 5.17 to 5.18 (#​372) @​dependabot[bot]
• Bump org.jenkins-ci.plugins:plugin from 5.12 to 5.17 (#​364) @​dependabot[bot]

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