chore: update Go server SDK to v7.16.0

[devin-ai-integration]

Bumps the example's LaunchDarkly Go server SDK in go.mod to the latest v7 release; no source changes.

• go-server-sdk/v7 v7.15.6 → v7.16.0 (latest within-major; released 2026-08-25)
• Indirect dep follows via go mod tidy: eventsource 1.10.0 → 1.14.0
• go-sdk-common/v3 stays at v3.5.1 (already latest) — the earlier bumps in this PR (7.15.6, 3.5.1) landed on main via chore: Bump github.com/launchdarkly/go-sdk-common/v3 from 3.5.0 to 3.5.1 #54/chore: Bump github.com/launchdarkly/go-server-sdk/v7 from 7.15.5 to 7.15.6 #55, so main is merged in and only the 7.16.0 bump remains
• No README/CI/toolchain change needed — SDK v7.16.0 still declares go 1.25.0, matching go.mod and the CI Go 1.25 pin
• No deprecated API usage: go vet and staticcheck (SA1019) are clean

Verified by running the example against a real server-side SDK key (not committed):

[LaunchDarkly] INFO: Starting LaunchDarkly client 7.16.0
*** SDK successfully initialized!
*** The 'hello-boolean' feature flag evaluates to true.

Implementation details

Latest-version evidence:

• https://proxy.golang.org/github.com/launchdarkly/go-server-sdk/v7/@latest → v7.16.0 (2026-08-25)
• https://proxy.golang.org/github.com/launchdarkly/go-sdk-common/v3/@latest → v3.5.1 (unchanged)

Major versions beyond v7/v3 are out of scope (stay within the configured major). go.sum is intentionally not committed in this repo, so the bump is expressed purely through go.mod.

Validation: go mod tidy, go build, go vet ./..., and staticcheck ./... all clean; the built binary connected via streaming, initialized, and evaluated hello-boolean → true in the hello-apps project. The flag-change listener path (GetFlagTracker().AddFlagValueChangeListener) is unchanged.

chore: prefix: this repo is an example app, not a released SDK; the change is dependency/build config only with no shipped-library surface.

Link to Devin session: https://app.devin.ai/sessions/c637223d402f4696bd8acf1a865cac30
Open in Devin Desktop: https://app.devin.ai/desktop/session/c637223d402f4696bd8acf1a865cac30?variant=devin

[devin-ai-integration]

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[devin-ai-integration]

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