Update Go env version to 1.25

[sanketsudake]

No description provided.

[Copilot]

Pull request overview

This pull request updates the Go environment version from 1.22/1.23 to 1.25 across the Fission Go environment configurations, including Docker images, build configurations, and example files. However, there is a critical issue: Go version 1.25 does not appear to exist yet.

Changes:

• Updated Go module version from 1.22 to 1.25 in example project
• Updated Docker image references from go-builder-1.12/go-env-1.12 to go-builder-1.25/go-env-1.25
• Updated environment configuration to reflect Go 1.25 runtime and bumped version to 1.33.0
• Updated Makefile targets and build arguments to use Go 1.25 for both builder and runtime images

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go/examples/specs/env.yaml	Updates Docker image references to use Go 1.25-based images with version 1.33.0
go/examples/module-example/go.mod	Updates Go module version directive from 1.22 to 1.25
go/envconfig.json	Updates runtime version, descriptions, builder/image names, and version number to reflect Go 1.25 for both environment entries
go/builder/Makefile	Updates build targets and GO_VERSION arguments from 1.22/1.23 to 1.25
go/Makefile	Updates environment image targets and GO_VERSION arguments from 1.22/1.23 to 1.25

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