build(deps): Bump the all group in /test/e2e with 1 update

Bumps the all group in /test/e2e with 1 update: [dexidp/dex](https://github.com/dexidp/dex).


Updates `dexidp/dex` from v2.38.0 to v2.39.0
- [Release notes](https://github.com/dexidp/dex/releases)
- [Commits](dexidp/dex@v2.38.0...v2.39.0)

---
updated-dependencies:
- dependency-name: dexidp/dex
  dependency-type: direct:production
  dependency-group: all
...

Signed-off-by: dependabot[bot] <support@github.com>

test/e2e/dexidp.Dockerfile

@@ -13,4 +13,4 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
-FROM ghcr.io/dexidp/dex:v2.38.0
+FROM ghcr.io/dexidp/dex:v2.39.0