mesa: update to 26.0.6 #67294

Job	Run time
Lint templates	44s
Build packages (x86_64-musl, x86_64-musl, musl, linux/amd64, 1)	24m 30s
Build packages (i686, i686, glibc, linux/386, 1)	25m 56s
Build packages (aarch64, x86_64, glibc, linux/amd64, 0)	26m 23s
Build packages (x86_64, x86_64, glibc, linux/amd64, 1)	23m 29s
Build packages (armv7l, x86_64, glibc, linux/amd64, 0)	23m 17s
Build packages (aarch64-musl, x86_64-musl, musl, linux/amd64, 0)	30m 24s
Build packages (armv6l-musl, x86_64-musl, musl, linux/amd64, 0)	27m 19s
	3h 2m 2s

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