Bump github.com/go-oauth2/oauth2/v4 from 4.5.2 to 4.5.4

Bumps [github.com/go-oauth2/oauth2/v4](https://github.com/go-oauth2/oauth2) from 4.5.2 to 4.5.4.
- [Release notes](https://github.com/go-oauth2/oauth2/releases)
- [Commits](go-oauth2/oauth2@v4.5.2...v4.5.4)

---
updated-dependencies:
- dependency-name: github.com/go-oauth2/oauth2/v4
  dependency-version: 4.5.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

go.mod

@@ -1,9 +1,9 @@
 module github.com/vgarvardt/go-oauth2-pg/v4
 
-go 1.20
+go 1.21
 
 require (
-	github.com/go-oauth2/oauth2/v4 v4.5.2
+	github.com/go-oauth2/oauth2/v4 v4.5.4
 	github.com/jackc/pgx/v4 v4.18.3
 	github.com/jmoiron/sqlx v1.4.0
 	github.com/stretchr/testify v1.10.0