change macos13 to 26 #27

Job	Run time
rocky	6m 31s
Build binary (macos-26, pikiwidb-v3.6.0-alpha-macos-amd64.tar.gz)	1m 51s
Build binary (ubuntu-latest, pikiwidb-v3.6.0-alpha-ubuntu-amd64.tar.gz)	8m 26s
Release artifacts	6s
	16m 54s

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