fix: downgrade eslint to fix bug

prefer-nullish-coalescing broke in the 6.19.0 update with a funky bug which has an open PR to be fixed https://github.com/typescript-eslint/typescript-eslint/issues/8261

packages/backend/package.json

@@ -230,8 +230,8 @@
 		"@types/vary": "1.1.3",
 		"@types/web-push": "3.6.3",
 		"@types/ws": "8.5.10",
-		"@typescript-eslint/eslint-plugin": "6.19.0",
-		"@typescript-eslint/parser": "6.19.0",
+		"@typescript-eslint/eslint-plugin": "6.18.1",
+		"@typescript-eslint/parser": "6.18.1",
 		"aws-sdk-client-mock": "3.0.1",
 		"cross-env": "7.0.3",
 		"eslint": "8.56.0",

packages/frontend/package.json

@@ -110,8 +110,8 @@
 		"@types/tinycolor2": "1.4.6",
 		"@types/uuid": "9.0.7",
 		"@types/ws": "8.5.10",
-		"@typescript-eslint/eslint-plugin": "6.19.0",
-		"@typescript-eslint/parser": "6.19.0",
+		"@typescript-eslint/eslint-plugin": "6.18.1",
+		"@typescript-eslint/parser": "6.18.1",
 		"@vitest/coverage-v8": "1.2.1",
 		"@vue/runtime-core": "3.4.15",
 		"acorn": "8.11.3",