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Update README.md, stac-fastapi badge to 6.0.0 #1199

Job	Run time
Python 3.9 testing with elasticsearch7	1m 52s
Python 3.9 testing with elasticsearch8	1m 52s
Python 3.10 testing with elasticsearch7	1m 57s
Python 3.9 testing with opensearch	2m 4s
Python 3.11 testing with elasticsearch7	2m 12s
Python 3.10 testing with elasticsearch8	2m 1s
Python 3.11 testing with elasticsearch8	2m 25s
Python 3.10 testing with opensearch	1m 52s
Python 3.12 testing with elasticsearch8	1m 55s
Python 3.12 testing with elasticsearch7	1m 57s
Python 3.11 testing with opensearch	2m 16s
Python 3.12 testing with opensearch	1m 50s
Python 3.13 testing with elasticsearch7	1m 53s
Python 3.13 testing with elasticsearch8	1m 53s
Python 3.13 testing with opensearch	1m 55s
	29m 54s

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