mesa: update to 26.0.8 #70368

Job	Run time
Lint templates	48s
Build packages (x86_64, x86_64, glibc, linux/amd64, 1)	21m 14s
Build packages (i686, i686, glibc, linux/386, 1)	22m 58s
Build packages (armv6l-musl, x86_64-musl, musl, linux/amd64, 0)	29m 13s
Build packages (x86_64-musl, x86_64-musl, musl, linux/amd64, 1)	23m 0s
Build packages (aarch64-musl, x86_64-musl, musl, linux/amd64, 0)	28m 49s
Build packages (aarch64, x86_64, glibc, linux/amd64, 0)	25m 3s
Build packages (armv7l, x86_64, glibc, linux/amd64, 0)	25m 55s
	2h 57m 0s

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