fix(src/default.json5): use workaround for ^ in non-multiline mode (#280)

* fix(src/default.json5): use workaround for ^ in non-multiline mode

* style: apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: risu729

default.json

@@ -39,7 +39,7 @@
 			datasourceTemplate: "undefined",
 			matchStrings: [
 				// test: https://regex101.com/r/8grHta
-				"^['\"]?(?<depName>[^_:\\s]+?)['\"]? *= *['\"](?<currentValue>\\d.+?)['\"]",
+				"(?:^|\r\n|\r|\n|$)['\"]?(?<depName>[^_:\\s]+?)['\"]? *= *['\"](?<currentValue>\\d.+?)['\"]",
 			],
 		},
 		// renovate does not support backends