Revert "Update go-sql-driver/mysql to v1.7.1" (#7006)

This reverts commit 0051277,
which was introduced by #6976

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/eggsampler/acme/v3 v3.4.0
 	github.com/go-logr/stdr v1.2.2
 	github.com/go-redis/redis/v8 v8.11.5
-	github.com/go-sql-driver/mysql v1.7.1
+	github.com/go-sql-driver/mysql v1.5.0
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
 	github.com/google/certificate-transparency-go v1.1.4
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
@@ -94,7 +94,11 @@ require (
 	k8s.io/klog/v2 v2.80.1 // indirect
 )
 
+// Versions of go-sql-driver/mysql >1.5.0 introduce performance regressions for
+// us, so we exclude them.
+
 // This version is required by parts of the honeycombio/beeline-go package
-// that we do not rely upon. It appears to introduce performance regressions
-// for us.
 exclude github.com/go-sql-driver/mysql v1.6.0
+
+// This version is required by borp
+exclude github.com/go-sql-driver/mysql v1.7.1

go.sum

@@ -168,8 +168,8 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
 github.com/go-redis/redis/v8 v8.11.5 h1:AcZZR7igkdvfVmQTPnu9WE37LRrO/YrBH5zWyjDC0oI=
 github.com/go-redis/redis/v8 v8.11.5/go.mod h1:gREzHqY1hg6oD9ngVRbLStwAWKhA0FEgq8Jd4h5lpwo=
-github.com/go-sql-driver/mysql v1.7.1 h1:lUIinVbN1DY0xBg0eMOzmmtGoHwWBbvnWubQUrtU8EI=
-github.com/go-sql-driver/mysql v1.7.1/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
+github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=