Bump Go version to remove vulnerability

[dubee]

Please increase the Go version used to build OPM. I am seeing a vulnerability in OPM for the os/exec package that is include in go 1.24.4. I can see that version of Go being used in the go.mod file. However, I also see golang:1.25-alpine used in the Dockerfiles, which doesn't seem to be honored? After moving up the version, a new release would be much appreciated.

Vulnerability report: https://pkg.go.dev/vuln/GO-2025-3956

[dubee]

@grokspawn, is this something you could help with? I would open a PR myself, but am not familiar with the build process.