Dependabot: Remove deprecated `reviewers` config #9603

Job	Run time
analyze-actions	54s
check-codeql-versions	49s
analyze-javascript (windows-2019, linked)	6m 18s
analyze-javascript (ubuntu-22.04)	3m 58s
analyze-javascript (ubuntu-22.04, linked)	4m 2s
analyze-javascript (macos-13)	6m 54s
analyze-javascript (windows-2022)	5m 54s
analyze-javascript (ubuntu-24.04, linked)	3m 54s
analyze-javascript (windows-2019)	6m 35s
analyze-javascript (macos-14)	4m 30s
analyze-javascript (ubuntu-24.04)	4m 0s
analyze-javascript (windows-2022, linked)	6m 4s
analyze-javascript (macos-13, linked)	5m 43s
analyze-javascript (macos-14, linked)	12m 57s
	1h 12m 32s

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