Bump jakarta.mail:jakarta.mail-api from 1.6.8 to 2.1.5

Bumps [jakarta.mail:jakarta.mail-api](https://github.com/jakartaee/mail-api) from 1.6.8 to 2.1.5.
- [Release notes](https://github.com/jakartaee/mail-api/releases)
- [Commits](jakartaee/mail-api@1.6.8...2.1.5)

---
updated-dependencies:
- dependency-name: jakarta.mail:jakarta.mail-api
  dependency-version: 2.1.5
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -345,7 +345,7 @@
         <spec.jaxrs.version>2.1</spec.jaxrs.version>
         <spec.jaxws.version>2.3</spec.jaxws.version>
         <spec.jws.version>1.1.1</spec.jws.version>
-        <spec.mail.version>1.6.8</spec.mail.version>
+        <spec.mail.version>2.1.5</spec.mail.version>
         <spec.xjc.version>2.3.2_2</spec.xjc.version>
 
         <spring.osgi.version>1.2.1</spring.osgi.version>