chore: tidy go.mod removing unused packages (#1046)

Signed-off-by: Harikrishnan Balagopal <harikrishmenon@gmail.com>

go.mod

@@ -126,7 +126,6 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/btree v1.0.1 // indirect
-	github.com/google/cel-go v0.9.0 // indirect
 	github.com/google/go-containerregistry v0.8.1-0.20220414143355-892d7a808387 // indirect
 	github.com/google/go-github/v41 v41.0.0 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
@@ -191,7 +190,6 @@ require (
 	github.com/spf13/afero v1.8.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/stoewer/go-strcase v1.2.0 // indirect
 	github.com/stretchr/testify v1.7.0 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
 	github.com/timtadh/data-structures v0.5.3 // indirect