change: use RFC 9535 syntax for jwt-role-claim-key config

BREAKING CHANGE

Breaks the string comparison operators implemented in #3813. Those can
be replaced with regex searches using JSON Path `search()` function.

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

test/io/configs/aliases.config

@@ -2,6 +2,6 @@ db-schema = "provided_through_alias"
 db-pool-timeout = 5
 max-rows = 1000
 pre-request = "check_alias"
-role-claim-key = ".aliased"
+role-claim-key = "$$.aliased"
 root-spec = "open_alias"
 secret-is-base64 = true