Bump github.com/google/go-tpm-tools from 0.2.1 to 0.3.1 (#250)

Bumps [github.com/google/go-tpm-tools](https://github.com/google/go-tpm-tools) from 0.2.1 to 0.3.1.
- [Release notes](https://github.com/google/go-tpm-tools/releases)
- [Commits](google/go-tpm-tools@v0.2.1...v0.3.1)

---
updated-dependencies:
- dependency-name: github.com/google/go-tpm-tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -6,9 +6,7 @@ require (
 	github.com/google/certificate-transparency-go v1.1.1
 	github.com/google/go-cmp v0.5.5
 	github.com/google/go-tpm v0.3.2
-	github.com/google/go-tpm-tools v0.2.1
+	github.com/google/go-tpm-tools v0.3.1
 	github.com/google/go-tspi v0.2.1-0.20190423175329-115dea689aad
-	golang.org/x/crypto v0.0.0-20210314154223-e6e6c4f2bb5b // indirect
 	golang.org/x/sys v0.0.0-20210316092937-0b90fd5c4c48
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )