fix(deps): update module go.opentelemetry.io/build-tools/gotmpl to v0.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
go.opentelemetry.io/build-tools/gotmpl	v0.14.0 -> v0.15.0

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Release Notes

open-telemetry/opentelemetry-go-build-tools (go.opentelemetry.io/build-tools/gotmpl)

### [`v0.15.0`](https://redirect.github.com/open-telemetry/opentelemetry-go-build-tools/blob/HEAD/CHANGELOG.md#v0150) [Compare Source](https://redirect.github.com/open-telemetry/opentelemetry-go-build-tools/compare/v0.14.0...v0.15.0) ##### 💡 Enhancements 💡 - `all`: bump minimum Go version to 1.22 ([#​605](https://redirect.github.com/open-telemetry/opentelemetry-go-build-tools/issues/605)) - `multimod`: Improve error message when the Go proxy misbehaves ([#​610](https://redirect.github.com/open-telemetry/opentelemetry-go-build-tools/issues/610)) ##### 🧰 Bug fixes 🧰 - `chloggen`: Fix bug that directed all output to stderr ([#​612](https://redirect.github.com/open-telemetry/opentelemetry-go-build-tools/issues/612))

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