Bump minimal supported rust version to 1.84 #401

Job	Run time
Check rustfmt style && run clippy	1m 17s
Check Minimal supported rust version (1.84.0)	45s
Check (stable, postgres, macos-13)	3m 55s
Check (stable, postgres, windows-latest)	14m 34s
Check (stable, postgres, ubuntu-22.04-arm)	4m 38s
Check (stable, mysql, macos-15)	2m 15s
Check (stable, mysql, ubuntu-22.04-arm)	3m 46s
Check (stable, sqlite, ubuntu-22.04-arm)	2m 43s
Check (stable, sqlite, windows-latest)	2m 57s
Check (stable, sqlite, ubuntu-latest)	2m 8s
Check (stable, mysql, ubuntu-latest)	3m 21s
Check (stable, mysql, windows-latest)	7m 17s
Check (stable, postgres, macos-15)	1m 58s
Check (stable, sqlite, macos-13)	2m 33s
Check (beta, mysql, ubuntu-latest)	3m 25s
Check (nightly, mysql, ubuntu-latest)	3m 21s
Check (nightly, sqlite, ubuntu-latest)	1m 31s
Check (stable, postgres, ubuntu-latest)	2m 17s
Check (stable, sqlite, macos-15)	1m 8s
Check (beta, postgres, ubuntu-latest)	2m 7s
Check (beta, sqlite, ubuntu-latest)	2m 4s
Check (nightly, postgres, ubuntu-latest)	1m 58s
Check (stable, mysql, macos-13)	4m 59s
	1h 16m 57s

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