Standardize node engine to >=22.20.0 (#61)

Align engines.node across all distributed templates to >=22.20.0.

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Co-authored-by: danil.radkovskyi <danil.radkovskyi@reddit.com>

Author: Krakabek

package.json

@@ -16,7 +16,7 @@
     "test:unit": "node --experimental-strip-types --no-warnings=ExperimentalWarning --test \"src/**/*.test.ts\""
   },
   "engines": {
-    "node": ">=22.12.0"
+    "node": ">=22.20.0"
   },
   "dependencies": {
     "@devvit/start": "0.13.10",