add mise config for node version (#2356)

Author: xavdid-stripe

.mise.toml

@@ -1,3 +1,8 @@
 [tools]
+# uses the active LTS, which is newer than the version pinned in codegen
+# can bump to the next even number each year in late Oct, but it's not time sensitive
+# https://endoflife.date/nodejs
+node = "22"
+
 # used in unit tests
 deno = "1"