update dependabot config; update related blast tweak #957

Job	Run time
mono_repo self validate	19s
analyze_and_format; Dart dev; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, pkg...	33s
analyze_and_format; Dart 3.0.0; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, p...	30s
analyze_and_format; Dart dev; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, pkg...	29s
unit_test; Dart 3.0.0; PKG: pkgs/firehose; `dart test`	2m 47s
unit_test; Dart 3.0.0; PKG: pkgs/corpus; `dart test`	39s
unit_test; Dart dev; PKG: pkgs/corpus; `dart test`	36s
unit_test; Dart 3.0.0; PKG: pkgs/dart_flutter_team_lints; `dart test`	31s
unit_test; Dart dev; PKG: pkgs/dart_flutter_team_lints; `dart test`	23s
unit_test; Dart dev; PKG: pkgs/firehose; `dart test`	1m 57s
analyze_format; Dart dev; PKG: pkgs/blast_repo; `dart format --output=none --set-exit-if-changed ...	20s
test; Dart dev; PKG: pkgs/blast_repo; `dart test --test-randomize-ordering-seed=random`	20s
	9m 24s

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