Pin @types/node to runtime major (Node 22) (#41)

The Lambdas in this stack run on the nodejs22.x runtime, but @types/node
had drifted to ^25 via Dependabot. A too-new types major still compiles,
so the mismatch passed CI while describing APIs absent at runtime.

Repin to ^22 to match the Lambda runtime and add a scoped Dependabot
ignore for @types/node semver-major bumps so the alignment can only be
broken deliberately, alongside a runtime upgrade. Minor/patch within the
major still flow. Sanctioned exception to the no-blanket-ignore rule
(engineering-handbook github-standards Pinning Principle).

.github/dependabot.yml

@@ -9,3 +9,13 @@ updates:
         update-types:
           - "minor"
           - "patch"
+    ignore:
+      # @types/node must track the runtime Node major, not the latest release.
+      # This stack's Lambdas run on nodejs22.x, so @types/node is pinned to ^22.
+      # Dependabot can't see the Lambda runtime and a too-new types major still
+      # compiles, so a major bump passes CI while being wrong at runtime. This is
+      # the sanctioned exception to the no-blanket-ignore rule (engineering-handbook
+      # github-standards Pinning Principle). Bump deliberately alongside a runtime
+      # upgrade. Minor/patch within the current major still flow.
+      - dependency-name: "@types/node"
+        update-types: ["version-update:semver-major"]

package-lock.json

@@ -16,7 +16,7 @@
       },
       "devDependencies": {
         "@aws-sdk/client-ssm": "^3.1070.0",
-        "@types/node": "^25.9.3",
+        "@types/node": "^22.0.0",
         "@types/source-map-support": "^0.5.10",
         "aws-cdk": "^2.1127.0",
         "esbuild": "^0.28.1",
@@ -1031,13 +1031,13 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "25.9.3",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.9.3.tgz",
-      "integrity": "sha512-603BddQMv3pUcr4U2dhujk83N2tTDVr/34wII2B6bJy6g+8WD6yUb11jszNs0gdi4PesVWl7ABt8nYMVpnLUcg==",
+      "version": "22.20.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.20.0.tgz",
+      "integrity": "sha512-QWlFW2wf3nTjC13/DqRnBpR4ZO36VJH/JVBkA/vcnmbTBNQIlnObqyqZE1tUR7+Ni23Lda8R1BxMfbXRpCUx5g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "undici-types": ">=7.24.0 <7.24.7"
+        "undici-types": "~6.21.0"
       }
     },
     "node_modules/@types/source-map-support": {
@@ -1622,9 +1622,9 @@
       }
     },
     "node_modules/undici-types": {
-      "version": "7.24.6",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.24.6.tgz",
-      "integrity": "sha512-WRNW+sJgj5OBN4/0JpHFqtqzhpbnV0GuB+OozA9gCL7a993SmU+1JBZCzLNxYsbMfIeDL+lTsphD5jN5N+n0zg==",
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
       "dev": true,
       "license": "MIT"
     },

package.json

@@ -13,7 +13,7 @@
   },
   "devDependencies": {
     "@aws-sdk/client-ssm": "^3.1070.0",
-    "@types/node": "^25.9.3",
+    "@types/node": "^22.0.0",
     "@types/source-map-support": "^0.5.10",
     "aws-cdk": "^2.1127.0",
     "esbuild": "^0.28.1",