docs: update copyright year to 2026

We are already in 2026. Update docs to update copyright info to year 2026.

Cc: peter.maydell@linaro.org
Cc: qemu-trivial@nongnu.org
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20260107045250.34420-1-anisinha@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2 files changed