go.mod: bump wireguard-go

https://github.com/WireGuard/wireguard-go/compare/e3ac4a0afb4e...b48af7099cad

Updates tailscale/tailscale#7053
Updates tailscale/corp#36989
Updates tailscale/tailscale#19820

Change-Id: I5652535bd32d3784702dcd2544abd430c2c95c96
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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