Bump github.com/buildpacks/libcnb from 1.22.0 to 1.23.0

Bumps [github.com/buildpacks/libcnb](https://github.com/buildpacks/libcnb) from 1.22.0 to 1.23.0.
- [Release notes](https://github.com/buildpacks/libcnb/releases)
- [Commits](buildpacks/libcnb@v1.22.0...v1.23.0)

---
updated-dependencies:
- dependency-name: github.com/buildpacks/libcnb
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -3,7 +3,7 @@ module github.com/paketo-buildpacks/environment-variables
 go 1.15
 
 require (
-	github.com/buildpacks/libcnb v1.22.0
+	github.com/buildpacks/libcnb v1.23.0
 	github.com/mattn/go-colorable v0.1.8 // indirect
 	github.com/onsi/gomega v1.16.0
 	github.com/paketo-buildpacks/libpak v1.54.0

go.sum

@@ -1,9 +1,11 @@
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/toml v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
+github.com/BurntSushi/toml v0.4.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
-github.com/buildpacks/libcnb v1.22.0 h1:jnQf51ASouvsRv/F3cprStM3SrXxlueVP7MK7b8/km0=
 github.com/buildpacks/libcnb v1.22.0/go.mod h1:g++R17SOuahPXTGDj1tbIcLr9csmzHrNVoTsdocdaMc=
+github.com/buildpacks/libcnb v1.23.0 h1:i8bVCDgqfYqpULGLl/Td2V2quVzUqrngWKGwvsEASLc=
+github.com/buildpacks/libcnb v1.23.0/go.mod h1:wIXTSW6ybtX9XIICQQqPnIUxx6t1bSZT7iIOKbEzRH0=
 github.com/creack/pty v1.1.15/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=