Fix maven-javadoc-plugin upgrade

[jlaur]

#16683 mentioned:

maven-javadoc-plugin, 3.2.0 to 3.6.3, see https://github.com/apache/maven-javadoc-plugin/releases

but actually changed version to 3.12.0, causing this build warning:

[WARNING] The POM for org.apache.maven.plugins:maven-javadoc-plugin:jar:3.12.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-javadoc-plugin:3.12.0: Plugin org.apache.maven.plugins:maven-javadoc-plugin:3.12.0 or one of its dependencies could not be resolved: org.apache.maven.plugins:maven-javadoc-plugin:jar:3.12.0 was not found in https://openhab.jfrog.io/openhab/libs-snapshot during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of openhab-snapshot has elapsed or updates are forced

I verified with openhab/openhab-core#4197 that 3.6.3 is correct:
https://github.com/openhab/openhab-core/blob/4dfbfb4995820089fbb92aaa64db09437d7e55ac/pom.xml#L324-L326

[holgerfriedrich]

@jlaur sorry for the typo in my PR and thanks for fixing this

[jlaur]

sorry for the typo in my PR and thanks for fixing this

No worries, luckily it was easy to spot and quick to fix. 😉

[holgerfriedrich]

Next time I should start writing a script for doing the updates (which can exclude things that are done together with Karaf upgrades, etc.)
Maybe we should use something like the service "renovate" to do this in a semi-automatic way like dependabot does.

[lsiepel]

LGTM

[jlaur]

Maybe we should use something like the service "renovate" to do this in a semi-automatic way like dependabot does.

I don't have experience with that, but it sure sounds like an interesting idea that could make upgrades easier and safer.