Bump golang.org/x/oauth2 from 0.27.0 to 0.28.0 (#897)

Bumps [golang.org/x/oauth2](https://github.com/golang/oauth2) from
0.27.0 to 0.28.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/golang/oauth2/commit/0042180b24f3cfe500f4cad3cabbc33c0a341f78"><code>0042180</code></a>
oauth2: Deep copy context client in NewClient</li>
<li><a
href="https://github.com/golang/oauth2/commit/ce350bff61d844ec163c2a0c0eaf35c71948cae7"><code>ce350bf</code></a>
oauth2: remove unneeded TokenSource implementation in transport
test</li>
<li><a
href="https://github.com/golang/oauth2/commit/44967abe9097d1169118ef5de80b29ef293edc15"><code>44967ab</code></a>
google: fix typos</li>
<li><a
href="https://github.com/golang/oauth2/commit/9c82a8cf7ac23b0c34d335ffae37db2995a5ad37"><code>9c82a8c</code></a>
oauth2.go: use a more straightforward return value</li>
<li>See full diff in <a
href="https://github.com/golang/oauth2/compare/v0.27.0...v0.28.0">compare
view</a></li>
</ul>
</details>
<br />


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go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/stretchr/testify v1.10.0
 	go.uber.org/multierr v1.11.0
 	golang.org/x/mod v0.24.0
-	golang.org/x/oauth2 v0.27.0
+	golang.org/x/oauth2 v0.28.0
 	google.golang.org/protobuf v1.36.5
 )
 

go.sum

@@ -111,8 +111,8 @@ golang.org/x/exp v0.0.0-20250128182459-e0ece0dbea4c h1:KL/ZBHXgKGVmuZBZ01Lt57yE5
 golang.org/x/exp v0.0.0-20250128182459-e0ece0dbea4c/go.mod h1:tujkw807nyEEAamNbDrEGzRav+ilXA7PCRAd6xsmwiU=
 golang.org/x/mod v0.24.0 h1:ZfthKaKaT4NrhGVZHO1/WDTwGES4De8KtWO0SIbNJMU=
 golang.org/x/mod v0.24.0/go.mod h1:IXM97Txy2VM4PJ3gI61r1YEk/gAj6zAHN3AdZt6S9Ww=
-golang.org/x/oauth2 v0.27.0 h1:da9Vo7/tDv5RH/7nZDz1eMGS/q1Vv1N/7FCrBhI9I3M=
-golang.org/x/oauth2 v0.27.0/go.mod h1:onh5ek6nERTohokkhCD/y2cV4Do3fxFHFuAejCkRWT8=
+golang.org/x/oauth2 v0.28.0 h1:CrgCKl8PPAVtLnU3c+EDw6x11699EWlsDeWNWKdIOkc=
+golang.org/x/oauth2 v0.28.0/go.mod h1:onh5ek6nERTohokkhCD/y2cV4Do3fxFHFuAejCkRWT8=
 golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
 golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=