Point cel-go links at the cel-expr/cel-go repository

The cel-go repository moved from google/cel-go to cel-expr/cel-go.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018CPujacpgZc2qAebVCmbjw

Author: claude

docs/howto/vet.md

@@ -7,7 +7,7 @@
 Rules are defined in the `sqlc` [configuration](../reference/config.md) file. They
 consist of a name, message, and a [Common Expression Language
 (CEL)](https://github.com/google/cel-spec) expression. Expressions are evaluated
-using [cel-go](https://github.com/google/cel-go).  If an expression evaluates to
+using [cel-go](https://github.com/cel-expr/cel-go).  If an expression evaluates to
 `true`, `sqlc vet` will report an error using the given message.
 
 ## Defining lint rules

docs/reference/changelog.md

@@ -1208,7 +1208,7 @@ Released 2023-07-06
 
 Rules are defined in the `sqlc` [configuration](config.md) file. They consist
 of a name, message, and a [Common Expression Language (CEL)](https://github.com/google/cel-spec)
-expression. Expressions are evaluated using [cel-go](https://github.com/google/cel-go).
+expression. Expressions are evaluated using [cel-go](https://github.com/cel-expr/cel-go).
 If an expression evaluates to `true`, an error is reported using the given message.
 
 While these examples are simplistic, they give you a flavor of the types of