deps: migrate go-vcr.v4 to v4.0.7 #10612

Dependency upgrade requiring source changes

Migrate gopkg.in/dnaeon/go-vcr.v3 to gopkg.in/dnaeon/go-vcr.v4@v4.0.7.

This newer major module path is intentionally excluded from the dependency-only updates in #10572 because it requires source import changes.

Acceptance criteria

• Update all matching core/extension imports and direct requirements together.
• Run go mod tidy and preserve core/extension shared direct version alignment.
• Compile core and all 18 Go extensions.
• Pass short unit suites in every source-affected module.
• Do not introduce local azd SDK replacements.