net/udprelay: use GOMAXPROCS instead of NumCPU for socket count

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runtime.NumCPU() returns the number of CPUs on the host, which in
containerized environments is the node's CPU count rather than the
container's CPU limit. This causes excessive memory allocation in
pods with low CPU requests running on large nodes, as each socket's
packetReadLoop allocates significant buffer memory.

Use runtime.GOMAXPROCS(0) instead, which is container-aware since
Go 1.25 and respects CPU limits set via cgroups.

Fixes #18774

Signed-off-by: Daniel Pañeda <daniel.paneda@clickhouse.com>

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