fix(deps): update github.com/go-gl/gl commit hash to e33571d (#612)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

go.mod

@@ -5,7 +5,7 @@ go 1.12
 require (
 	github.com/Xuanwo/go-locale v1.0.0
 	github.com/davecgh/go-spew v1.1.1
-	github.com/go-gl/gl v0.0.0-20210501111010-69f74958bac0
+	github.com/go-gl/gl v0.0.0-20210812231146-e33571d17ed6
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210727001814-0db043d8d5be
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.7.0

go.sum

@@ -15,6 +15,8 @@ github.com/go-gl/gl v0.0.0-20210315015930-ae072cafe09d h1:o81yRlBATU4PRn97lydmsq
 github.com/go-gl/gl v0.0.0-20210315015930-ae072cafe09d/go.mod h1:482civXOzJJCPzJ4ZOX/pwvXBWSnzD4OKMdH4ClKGbk=
 github.com/go-gl/gl v0.0.0-20210501111010-69f74958bac0 h1:7xNa69TzlTrKtlBtE4yyNRFP9oqAneXAs9oKJkVOECs=
 github.com/go-gl/gl v0.0.0-20210501111010-69f74958bac0/go.mod h1:wjpnOv6ONl2SuJSxqCPVaPZibGFdSci9HFocT9qtVYM=
+github.com/go-gl/gl v0.0.0-20210812231146-e33571d17ed6 h1:Ww1K+TzQDcMuvQERT9XRkLcLrSfMRpcjPdygylG+cFU=
+github.com/go-gl/gl v0.0.0-20210812231146-e33571d17ed6/go.mod h1:wjpnOv6ONl2SuJSxqCPVaPZibGFdSci9HFocT9qtVYM=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200420212212-258d9bec320e h1:8ywu4ELC/6owgOZlZx75CyYS5AYwUT2L+hzPModKvag=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200420212212-258d9bec320e/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200625191551-73d3c3675aa3 h1:q521PfSp5/z6/sD9FZZOWj4d1MLmfQW8PkRnI9M6PCE=