build(deps-dev): bump eslint-plugin-yml in /backend

Bumps [eslint-plugin-yml](https://github.com/ota-meshi/eslint-plugin-yml) from 1.18.0 to 1.19.0.
- [Release notes](https://github.com/ota-meshi/eslint-plugin-yml/releases)
- [Changelog](https://github.com/ota-meshi/eslint-plugin-yml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ota-meshi/eslint-plugin-yml/compare/v1.18.0...v1.19.0)

---
updated-dependencies:
- dependency-name: eslint-plugin-yml
  dependency-version: 1.19.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

backend/package-lock.json

@@ -31,7 +31,7 @@
         "eslint-plugin-prettier": "^5.5.4",
         "eslint-plugin-promise": "^6.1.1",
         "eslint-plugin-security": "^3.0.1",
-        "eslint-plugin-yml": "^1.18.0",
+        "eslint-plugin-yml": "^1.19.0",
         "jest": "^30.1.3",
         "ts-jest": "^29.4.4",
         "tsx": "^4.20.6",
@@ -4831,6 +4831,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/diff-sequences": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/diff-sequences/-/diff-sequences-27.5.1.tgz",
+      "integrity": "sha512-k1gCAXAsNgLwEL+Y8Wvl+M6oEFj5bgazfZULpS5CneoPPXRaCCW7dm+q21Ky2VEE5X+VeRDBVg1Pcvvsr4TtNQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
     "node_modules/dir-glob": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
@@ -5564,13 +5574,14 @@
       }
     },
     "node_modules/eslint-plugin-yml": {
-      "version": "1.18.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-yml/-/eslint-plugin-yml-1.18.0.tgz",
-      "integrity": "sha512-9NtbhHRN2NJa/s3uHchO3qVVZw0vyOIvWlXWGaKCr/6l3Go62wsvJK5byiI6ZoYztDsow4GnS69BZD3GnqH3hA==",
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-yml/-/eslint-plugin-yml-1.19.0.tgz",
+      "integrity": "sha512-S+4GbcCWksFKAvFJtf0vpdiCkZZvDJCV4Zsi9ahmYkYOYcf+LRqqzvzkb/ST7vTYV6sFwXOvawzYyL/jFT2nQA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "debug": "^4.3.2",
+        "diff-sequences": "^27.5.1",
         "escape-string-regexp": "4.0.0",
         "eslint-compat-utils": "^0.6.0",
         "natural-compare": "^1.4.0",

backend/package.json

@@ -33,7 +33,7 @@
     "eslint-plugin-prettier": "^5.5.4",
     "eslint-plugin-promise": "^6.1.1",
     "eslint-plugin-security": "^3.0.1",
-    "eslint-plugin-yml": "^1.18.0",
+    "eslint-plugin-yml": "^1.19.0",
     "jest": "^30.1.3",
     "ts-jest": "^29.4.4",
     "tsx": "^4.20.6",