Replace logrus with gobuffalo/logger

[paganotoni]

This PR replaces direct usage of "github.com/sirupsen/logrus" with "github.com/gobuffalo/logger/v2" to align with the Buffalo ecosystem standard logging interface.

Changes

• worker/simple.go: Use logger.New() from logger/v2
• render/template.go: Use package-level log variable with logger/v2
• plugins/plugins.go: Use package-level plog variable with logger/v2, added package documentation
• errors_test.go: Remove direct logrus dependency, simplify logger test
• logger.go: Updated to use logger/v2
• options.go: Updated to use logger/v2
• go.mod: Updated to github.com/gobuffalo/logger/v2 v2.0.0

What's New in logger v2.0.0

• Uses slog (Go standard library log/slog) as the default logger implementation
• logrus backend moved to a subpackage for users who prefer it
• Lighter dependency tree (no direct logrus dependency in default case)

Benefits

• Consistent logging interface across Buffalo codebase
• Uses Go standard library slog as the default backend
• Reduces external dependencies
• Uses the standard Buffalo logger abstraction