Bump org.simplejavamail:simple-java-mail from 8.11.2 to 8.12.6 (#762)

Bumps [org.simplejavamail:simple-java-mail](https://github.com/bbottema/simple-java-mail) from 8.11.2 to 8.12.6.
- [Release notes](https://github.com/bbottema/simple-java-mail/releases)
- [Changelog](https://github.com/bbottema/simple-java-mail/blob/master/RELEASE.txt)
- [Commits](bbottema/simple-java-mail@8.11.2...8.12.6)

---
updated-dependencies:
- dependency-name: org.simplejavamail:simple-java-mail
  dependency-version: 8.12.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -110,7 +110,7 @@
     <postgresql.version>42.7.4</postgresql.version>
     <scala.version>2.13.12</scala.version>
     <scala.xml.version>2.3.0</scala.xml.version>
-    <simplejavamail.version>8.11.2</simplejavamail.version>
+    <simplejavamail.version>8.12.6</simplejavamail.version>
     <slf4j.version>2.0.16</slf4j.version>
     <spotbugs.annotations.version>4.8.6</spotbugs.annotations.version>
     <twirl.api.version>2.0.3</twirl.api.version>