Merge pull request #18 from guardian/aa/node24

chore: Update to Node 24 (current LTS)

Author: akash1810

.gitattributes

@@ -0,0 +1,4 @@
+# These files are generated, hide their diff in a PR by default
+# See https://docs.github.com/en/repositories/working-with-files/managing-files/customizing-how-changed-files-appear-on-github
+index.js linguist-generated
+

.nvmrc

@@ -1 +1 @@
-v20.18.1
+v24

action.yml

@@ -5,5 +5,5 @@ inputs:
     description: One or more (private SSH) Deploy Keys. Note, keys must be ed25519; rsa is not supported. The target repository must be added as a comment to the key, e.g. like `ssh-keygen ... -C "git@github.com:guardian/repo.git"`.
     required: true
 runs:
-  using: "node20"
+  using: "node24"
   main: "index.js"