Prepare version 12.1.0 release. (#761)

Author: kpfleming

CHANGELOG.md

@@ -2,7 +2,19 @@
 
 ## [UNRELEASED]
 
-[Full Changelog](https://github.com/fastly/go-fastly/compare/v12.0.0...)
+[Full Changelog](https://github.com/fastly/go-fastly/compare/v12.1.0...)
+
+### Breaking:
+
+### Enhancements:
+
+### Bug fixes:
+
+### Dependencies:
+
+## [v12.1.0](https://github.com/fastly/go-fastly/releases/tag/v12.1.0) (2025-09-30)
+
+[Full Changelog](https://github.com/fastly/go-fastly/compare/v12.0.0...v12.1.0)
 
 ### Breaking:
 

fastly/client.go

@@ -64,7 +64,7 @@ const UserAgentEnvVar = "FASTLY_USER_AGENT"
 var ProjectURL = "github.com/fastly/go-fastly"
 
 // ProjectVersion is the version of this library.
-var ProjectVersion = "12.0.0"
+var ProjectVersion = "12.1.0"
 
 // UserAgent is the user agent for this particular client.
 var UserAgent = fmt.Sprintf("FastlyGo/%s (+%s; %s)",