Update go and remove unused libraries

[Co-authored by: Dave Walter <[email protected]>]

Author: rizwanreza

go.mod

@@ -1,6 +1,6 @@
 module github.com/pivotal-cf/kiln
 
-go 1.22.6
+go 1.23
 
 require (
 	github.com/Masterminds/semver/v3 v3.2.1
@@ -17,7 +17,6 @@ require (
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
 	github.com/go-git/go-billy/v5 v5.5.0
 	github.com/go-git/go-git/v5 v5.11.0
-	github.com/google/go-github/v40 v40.0.0
 	github.com/google/go-github/v50 v50.2.0
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/masterminds/sprig v2.22.0+incompatible

go.sum

@@ -301,12 +301,9 @@ github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/go-github/v40 v40.0.0 h1:oBPVDaIhdUmwDWRRH8XJ/dZG+Rn755i08+Hp1uJHlR0=
-github.com/google/go-github/v40 v40.0.0/go.mod h1:G8wWKTEjUCL0zdbaQvpwDk0hqf6KZgPQH+ssJa+/NVc=
 github.com/google/go-github/v50 v50.0.0/go.mod h1:Ev4Tre8QoKiolvbpOSG3FIi4Mlon3S2Nt9W5JYqKiwA=
 github.com/google/go-github/v50 v50.2.0 h1:j2FyongEHlO9nxXLc+LP3wuBSVU9mVxfpdYUexMpIfk=
 github.com/google/go-github/v50 v50.2.0/go.mod h1:VBY8FB6yPIjrtKhozXv4FQupxKLS6H4m6xFZlT43q8Q=