END is not a reserved word

Hello all

A simplification of the problem I found:

Here is a function (taken from the postgres documentation)

```

CREATE FUNCTION add(integer, integer) RETURNS integer

    AS 'select $1 + $2;'

    LANGUAGE SQL

    IMMUTABLE

    RETURNS NULL ON NULL INPUT;

```

"Accidentally" did the following:

```

SELECT add(3,4) END;
```

On postgres 14 and over+ there is no problem:

```

 end 

-----

   7

(1 row)
```
On Postgres 13 and under:
```
ERROR:  syntax error at or near "END"
LINE 1: SELECT add(3,4) END;
```

On the list of reserved words, END is marked as reserved.

https://www.postgresql.org/docs/current/sql-keywords-appendix.html

Since postgres 14+ is not reserved and can be used, for example as a column name.

Unless I am mistaken that shouldn't happen.

Made a small CI test with the code above: (link will be unavailable when gihub removes the workflow)
Fails as expected as `end` is a reserved word (pg13)

But on the other test runs it has no problem (pg17)
https://github.com/cvvergara/pgrouting/actions/runs/17222387428/job/48860365870#step:8:27

Regards
Vicky Vergara
pgRouting developer