Excavator: Bump 2 go dependencies

[svc-excavator-bot]

excavator is a bot for automating changes across repositories.

Changes produced by the go/bump-go-dependencies-oss check.

Go Dependency Updates

Module	From Version	To Version	Direct/Indirect	Target
github.com/hashicorp/terraform-plugin-framework	v1.15.0	v1.15.1	Direct	✓
github.com/hashicorp/terraform-plugin-go	v0.27.0	v0.28.0	Indirect	✓

Legend:

• Direct/Indirect: Shows whether the dependency is direct or indirect in go.mod
• New: Newly added dependency (wasn't in go.mod before)
• Removed: Dependency that was removed from go.mod
• Target: ✓ = The dependency specified in the update instruction

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