bump(csharpier): update to v0.26.0 #3944

Job	Run time
Check package diffs	7s
Validate package definitions	7s
Test packages (darwin_arm64)	1m 24s
Test packages (darwin_x64)	1m 17s
Test packages (linux_arm)	37s
Test packages (linux_arm64)	28s
Test packages (linux_arm64_gnu)	30s
Test packages (linux_arm_gnu)	36s
Test packages (linux_x64)	1m 0s
Test packages (linux_x64_gnu)	1m 10s
Test packages (linux_x86)	44s
Test packages (win_arm)	2m 23s
Test packages (win_arm64)	1m 59s
Test packages (win_x64)	2m 59s
Test packages (win_x86)	1m 47s
Status check	0s
	17m 8s

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