Go 1.26.5

[kevinmcconnell]

• Build with Go 1.26.5
• Update dependencies

[Copilot]

Pull request overview

Updates the project’s build toolchain and Go module dependencies to align local, CI, and container builds on Go 1.26.5, while refreshing several indirect dependency versions.

Changes:

• Bumped the Go version in go.mod to 1.26.5 (used by CI via go-version-file).
• Updated a set of Go dependencies (notably golang.org/x/* and Prometheus-related modules).
• Updated Docker build images to golang:1.26.5 for both the main image and the upstream example.

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Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
go.sum	Refreshed dependency checksums consistent with the dependency updates.
go.mod	Bumped Go version and updated dependency versions (direct + indirect).
Dockerfile	Updated the Go builder image tag to golang:1.26.5.
example/upstream/Dockerfile	Updated the Go builder image tag to golang:1.26.5 for the example upstream.

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