[hotfix] Correct fabric8 version to 7.3.1 in NOTICE files

[spuru9]

What is the purpose of the change

This pull request corrects a pre-existing version mismatch in the NOTICE files where io.fabric8 artifacts were listed as version 7.3.0 while the project actually uses 7.3.1 (as defined in the root pom.xml). This mismatch was originally introduced in [FLINK-37885].

Brief change log

• Updated all io.fabric8 artifact versions from 7.3.0 to 7.3.1 in the following files:
  • flink-kubernetes-operator/src/main/resources/META-INF/NOTICE
  • flink-autoscaler-standalone/src/main/resources/META-INF/NOTICE

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changes to the CustomResourceDescriptors: no
• Core observer or reconciler logic that is regularly executed: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

[spuru9]

@gyfora As part of the syncing the NOTICE file as part of addressing the PR comment, I saw this minor miss from #982, can you check.
Have created a hotfix as its unrelated change.

[spuru9]

@gyfora The CI is green, can you help with the merge.