Bump gVisor build tags to go1.20

Upstream Go tip has updated its version to 1.19, so we need to bump these build
tags to allow tip testing.

Ideally we'll get checklinkname (or equivalent) to check these remaining unsafe
uses (like internal struct field offsets) soon.

For golang/go#51445.

PiperOrigin-RevId: 432215030

Author: prattmic

pkg/gohacks/gohacks_unsafe.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build go1.13 && !go1.19
-// +build go1.13,!go1.19
+//go:build go1.13 && !go1.20
+// +build go1.13,!go1.20
 
 // //go:linkname directives type-checked by checklinkname. Any other
 // non-linkname assumptions outside the Go 1 compatibility guarantee should

pkg/goid/goid.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build go1.12 && !go1.19
-// +build go1.12,!go1.19
+//go:build go1.12 && !go1.20
+// +build go1.12,!go1.20
 
 // Check type signatures when updating Go version.
 

pkg/procid/procid_amd64.s

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build amd64 && go1.8 && !go1.19 && go1.1
-// +build amd64,go1.8,!go1.19,go1.1
+//go:build amd64 && go1.8 && !go1.20 && go1.1
+// +build amd64,go1.8,!go1.20,go1.1
 
 // //go:linkname directives type-checked by checklinkname. Any other
 // non-linkname assumptions outside the Go 1 compatibility guarantee should

pkg/procid/procid_arm64.s

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build arm64 && go1.8 && !go1.19 && go1.1
-// +build arm64,go1.8,!go1.19,go1.1
+//go:build arm64 && go1.8 && !go1.20 && go1.1
+// +build arm64,go1.8,!go1.20,go1.1
 
 // //go:linkname directives type-checked by checklinkname. Any other
 // non-linkname assumptions outside the Go 1 compatibility guarantee should

pkg/sync/mutex_unsafe.go

@@ -3,8 +3,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.13 && !go1.19
-// +build go1.13,!go1.19
+//go:build go1.13 && !go1.20
+// +build go1.13,!go1.20
 
 // When updating the build constraint (above), check that syncMutex matches the
 // standard library sync.Mutex definition.

pkg/sync/runtime_amd64.go

@@ -3,8 +3,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build amd64 && go1.8 && !go1.19 && !goexperiment.staticlockranking
-// +build amd64,go1.8,!go1.19,!goexperiment.staticlockranking
+//go:build amd64 && go1.8 && !go1.20 && !goexperiment.staticlockranking
+// +build amd64,go1.8,!go1.20,!goexperiment.staticlockranking
 
 package sync
 

pkg/sync/runtime_amd64.s

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build amd64 && go1.8 && !go1.19 && !goexperiment.staticlockranking
-// +build amd64,go1.8,!go1.19,!goexperiment.staticlockranking
+//go:build amd64 && go1.17 && !go1.20 && !goexperiment.staticlockranking
+// +build amd64,go1.8,!go1.20,!goexperiment.staticlockranking
 
 #include "textflag.h"
 

pkg/sync/runtime_unsafe.go

@@ -3,8 +3,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.13 && !go1.19
-// +build go1.13,!go1.19
+//go:build go1.13 && !go1.20
+// +build go1.13,!go1.20
 
 // //go:linkname directives type-checked by checklinkname. Any other
 // non-linkname assumptions outside the Go 1 compatibility guarantee should