fix: Bump target-duckdb to 0.8

[edgarrmondragon]

• https://pypi.org/project/target-duckdb/0.8.0/

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[github-actions]

Testing plugin target-duckdb (jwills variant):

Starting test job...
...
Job completed.

Usage info

melty-bot % target-duckdb --help
usage: target-duckdb [-h] [-c CONFIG]

options:
  -h, --help            show this help message and exit
  -c CONFIG, --config CONFIG
                        Config file

Detected capabilities

• ❌ 'discover'
• ❌ 'catalog'
• ❌ 'properties'
• ❌ 'state'
• ❌ 'about'