fix: require rustac>=0.9.13 for correct handling of start/end_datetimes

[hrodmn]

rustac's duckdb client required a patch to correctly handle start_datetime and end_datetime in datetime searches (stac-utils/rustac#1071). This patch was included in v0.9.13 of rustac-py!

cc @s-kganz

resolves #76

[github-actions]

Benchmark Comparison

Test	Baseline (ms)	PR (ms)	Change
test_band_access_pattern[multi_band]	842.7	841.8	-0.1%
test_band_access_pattern[single_band]	775.9	782.5	+0.9%
test_explain_fetch_headers	301.5	301.6	+0.0%
test_full_compute	616.3	641.5	+4.1%
test_mosaic_method[first]	622.0	623.5	+0.2%
test_mosaic_method[median]	644.3	673.8	+4.6%
test_native_crs_resolution	9884.1	10734.1	+8.6%
test_open_overhead	265.8	271.1	+2.0%
test_reproject_workers[1]	1410.7	1396.2	-1.0%
test_reproject_workers[4]	823.8	834.7	+1.3%
test_time_step_parallelism[dask_time_1]	823.8	831.9	+1.0%
test_time_step_parallelism[no_dask]	700.2	722.4	+3.2%