Build(deps): Bump github.com/stretchr/testify from 1.11.1 to 1.12.1

[MusicalNinjaDad]

Bumps github.com/stretchr/testify from 1.11.1 to 1.12.1.

Updates to go.yaml.in/yaml/v3 and removes pmezard/go-difflib dependency.

Closes #166

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• The replacement of gopkg.in/yaml.v3 with go.yaml.in/yaml/v3 is non-standard; double-check that this module path is intentional and correctly resolvable in your environment.
• Since the pmezard/go-difflib indirect dependency was removed, confirm that any assertion output or diff-related functionality from testify still behaves as expected with the new version.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The replacement of `gopkg.in/yaml.v3` with `go.yaml.in/yaml/v3` is non-standard; double-check that this module path is intentional and correctly resolvable in your environment.
- Since the `pmezard/go-difflib` indirect dependency was removed, confirm that any assertion output or diff-related functionality from `testify` still behaves as expected with the new version.

## Individual Comments

### Comment 1
<location path="go.mod" line_range="16" />
<code_context>
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
+	go.yaml.in/yaml/v3 v3.0.5 // indirect
 )
</code_context>
<issue_to_address>
**issue (bug_risk):** The module path `go.yaml.in/yaml/v3` looks incorrect and will likely break dependency resolution.

The prior dependency correctly used `gopkg.in/yaml.v3`. The new path `go.yaml.in/yaml/v3` is not a valid Go module and will cause `go mod tidy` / `go get` to fail. If you’re upgrading to v3.0.5, this line should be `gopkg.in/yaml.v3 v3.0.5` instead.
</issue_to_address>

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[sourcery-ai]

issue (bug_risk): The module path go.yaml.in/yaml/v3 looks incorrect and will likely break dependency resolution.

The prior dependency correctly used gopkg.in/yaml.v3. The new path go.yaml.in/yaml/v3 is not a valid Go module and will cause go mod tidy / go get to fail. If you’re upgrading to v3.0.5, this line should be gopkg.in/yaml.v3 v3.0.5 instead.