Revert "Bump the all-npm-dependencies group across 2 directories with 4 updates" (#600)

Reverts #598

Got confused that the checksum is correct on internal
build-releases-npm. However it is still incorrect on
build-snapshots-npm.

Author: beckermarc

mtx/sidecar/package-lock.json

@@ -3,7 +3,7 @@
 	"version": "1.0.0",
 	"description": "Generated by cds-services-archetype",
 	"devDependencies": {
-		"@sap/cds-dk": "9.6.1",
+		"@sap/cds-dk": "9.6.0",
 		"@sap/cds-mtxs": "^3"
 	},
 	"workspaces": [