Bump minimum duckdb version to 0.8.0

[ADBond]

Type of PR

• BUG
• FEAT
• MAINT
• DOC

Is your Pull Request linked to an existing Issue or Pull Request?

Closes #1311.

Give a brief description for the solution you have provided

As discussed in linked issue and elsewhere it will cause a lot less pain to have a version of duckdb installed which features damerau_levenshtein, especially as this keeps on coming up as a point of confusion/error for users.

PR Checklist

• Added documentation for changes
• Added feature to example notebooks at tutorial in splink_demos (if appropriate)
• Added tests (if appropriate)
• Made changes based off the latest version of Splink
• Run the linter

[github-actions]

Test: test_2_rounds_1k_duckdb

Percentage change: 3.0%

	date	time	stats_mean	stats_min	commit_info_branch	commit_info_id	machine_info_cpu_brand_raw	machine_info_cpu_hz_actual_friendly	commit_hash
849	2022-07-12	18:40:05	1.89098	1.87463	splink3	c334bb9	Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz	2.7934 GHz	c334bb9
1818	2023-07-06	15:38:43	1.93959	1.93094	(detached head)	53df6c2	Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz	2.2947 GHz	53df6c2

Test: test_2_rounds_1k_sqlite

Percentage change: 1.4%

	date	time	stats_mean	stats_min	commit_info_branch	commit_info_id	machine_info_cpu_brand_raw	machine_info_cpu_hz_actual_friendly	commit_hash
851	2022-07-12	18:40:05	4.32179	4.25898	splink3	c334bb9	Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz	2.7934 GHz	c334bb9
1820	2023-07-06	15:38:43	4.35231	4.31775	(detached head)	53df6c2	Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz	2.2947 GHz	53df6c2

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