Fetch connector version correctly

[buinauskas]

Type of PR

• Documentation changes
• Code changes
• Test changes
• CI-CD changes
• GitHub Template changes

Purpose of PR

Currently, the connector version is shown as 0.0.0.0.

[
  {
    "class": "com.vinted.kafka.connect.vespa.VespaSinkConnector",
    "type": "sink",
    "version": "0.0.0.0"
  }
]

After the change, it is correctly taken from pom.xml file.

[
  {
    "class": "com.vinted.kafka.connect.vespa.VespaSinkConnector",
    "type": "sink",
    "version": "1.0.5-SNAPSHOT"
  }
]

Testing

• Did you add testing to account for any new or changed work?

Review notes

Issues Closed or Referenced

• Closes # (this will automatically close the issue when the PR closes)
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