Bumping koha-image.

Included changes in the new image (from koha-salt-docker):
* e63c575 - Fix rest.pl permissions (9 days ago) <Benjamin Rokseth>
* 4b2562b - rest.pl must be executable (9 days ago) <Benjamin Rokseth>
* f4fcf57 - Fix typo in koha_restful_test db (9 days ago) <Benjamin Rokseth>
* d23e36b - Rename restful test database name in entrypoint (9 days ago) <Benjamin Rokseth>