Add v2_26_0 arrays to backward compatibility matrix. (#5314) #1160

Job	Run time
Package-Binary-Release (macos-arm64)	20m 50s
Package-Binary-Release (macos-x86_64)	21m 51s
Package-Binary-Release (linux-x86_64)	39m 31s
Package-Binary-Release (linux-x86_64-noavx2)	40m 47s
Package-Binary-Release (windows-x86_64)	27m 38s
Package-Source-Release (ubuntu-20.04)	4m 40s
Test-Release-Artifacts	4s
Publish-Release	0s
Generate-Release-List	0s
Create-Issue-On-Fail	0s
	2h 35m 21s

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