docs: add 0.12.3 to release notes toctree
docs: add 0.12.3 to release notes toctree

hcxiong/tsuru,ggarnier/tsuru,hcxiong/tsuru,guilhermebr/tsuru,guilhermebr/tsuru,tsuru/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,ggarnier/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,Endika/tsuru,ggarnier/tsuru,Endika/tsuru,gciotta/tsuru,tsuru/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,gciotta/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,hcxiong/tsuru,guilhermebr/tsuru,guilhermebr/tsuru,tsuru/tsuru,gwmoura/tsuru,ggarnier/tsuru,gciotta/tsuru,gwmoura/tsuru,tsuru/tsuru,cezarsa/tsuru,Endika/tsuru