build(deps): bump google.golang.org/protobuf from 1.31.0 to 1.33.0

Bumps google.golang.org/protobuf from 1.31.0 to 1.33.0.

---
updated-dependencies:
- dependency-name: google.golang.org/protobuf
  dependency-type: indirect
...

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

go.mod

@@ -1,11 +1,3 @@
 module toc.go
 
 go 1.16
-
-require (
-	github.com/google/go-github v17.0.0+incompatible // indirect
-	github.com/google/go-querystring v1.1.0 // indirect
-	golang.org/x/exp v0.0.0-20240409090435-93d18d7e34b8 // indirect
-	golang.org/x/oauth2 v0.19.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
-)