golangci-lint v2.12.0 deprecated gomodguard, and `linters.default: all`
enables it, so every lint run in every consuming Go repo prints a
deprecation warning. Disable the old name, which is what silences the
warning; name gomodguard_v2 in linters.enable so the settings block has
a visible owner; give it a blocked module list.
The block list restates only decisions already recorded in the Go
package defaults: zerolog, the pre-fork go-redis/redis, sergi/go-diff
and hexops/gotextdiff. Recorded rejections that repos vendoring this
file still require are deliberately absent, so a re-vendor cannot
redden a repo that has done nothing wrong.
