chore: update action permissions to reduce write privilege scope

[github-actions[bot]]

Bencher

Report	Thu, February 22, 2024 at 15:36:22 UTC
Project	theseus-rs/postgresql-embedded
Branch	update-action-permissions
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	204640000.000
lifecycle	➖ (view plot)	729160000.000

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (51b48e1) 98.32% compared to head (36b7e4f) 98.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #28 +/- ## ======================================= Coverage 98.32% 98.32% ======================================= Files 53 53 Lines 6516 6516 ======================================= Hits 6407 6407 Misses 109 109 ```

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