security/lua-resty-openidc: switch to lua-resty-session3

There is apparently currently no clear plan on when/if lua-resty-openidc
will be updated to include changes for lua-resty-session 4.X, see
discussions on

https://github.com/zmartzone/lua-resty-openidc/issues/480

Additionally:

• give up maintainership

PR: 281143, 281142, 281079