Update dependencies

vendor/github.com/googleapis/gax-go/v2/.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-    "v2": "2.12.1"
+    "v2": "2.12.2"
 }

vendor/github.com/googleapis/gax-go/v2/CHANGES.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [2.12.2](https://github.com/googleapis/gax-go/compare/v2.12.1...v2.12.2) (2024-02-23)
+
+
+### Bug Fixes
+
+* **v2/callctx:** fix SetHeader race by cloning header map ([#326](https://github.com/googleapis/gax-go/issues/326)) ([534311f](https://github.com/googleapis/gax-go/commit/534311f0f163d101f30657736c0e6f860e9c39dc))
+
 ## [2.12.1](https://github.com/googleapis/gax-go/compare/v2.12.0...v2.12.1) (2024-02-13)
 
 

vendor/github.com/googleapis/gax-go/v2/callctx/callctx.go

@@ -74,9 +74,27 @@ func SetHeaders(ctx context.Context, keyvals ...string) context.Context {
 	h, ok := ctx.Value(headerKey).(map[string][]string)
 	if !ok {
 		h = make(map[string][]string)
+	} else {
+		h = cloneHeaders(h)
 	}
+
 	for i := 0; i < len(keyvals); i = i + 2 {
 		h[keyvals[i]] = append(h[keyvals[i]], keyvals[i+1])
 	}
 	return context.WithValue(ctx, headerKey, h)
 }
+
+// cloneHeaders makes a new key-value map while reusing the value slices.
+// As such, new values should be appended to the value slice, and modifying
+// indexed values is not thread safe.
+//
+// TODO: Replace this with maps.Clone when Go 1.21 is the minimum version.
+func cloneHeaders(h map[string][]string) map[string][]string {
+	c := make(map[string][]string, len(h))
+	for k, v := range h {
+		vc := make([]string, len(v))
+		copy(vc, v)
+		c[k] = vc
+	}
+	return c
+}

vendor/github.com/googleapis/gax-go/v2/internal/version.go

@@ -30,4 +30,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "2.12.1"
+const Version = "2.12.2"