CI: test against a newer Go tip

While here, update staticcheck.

.github/workflows/test.yml

@@ -60,7 +60,7 @@ jobs:
     - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
       uses: dominikh/staticcheck-action@v1
       with:
-        version: "2023.1"
+        version: "2023.1.2"
         install-go: false
 
   # We don't care about GOARCH=386 particularly,
@@ -84,7 +84,7 @@ jobs:
     steps:
     - name: Install Go
       env:
-        GO_COMMIT: 6d4de4e386cd9e4ec32937ab2d4f79317db461cd # 2023-01-31
+        GO_COMMIT: ffb07d0c66db2f3f33faedf2927f9aa476d47720 # 2023-02-25
       run: |
         cd $HOME
         mkdir $HOME/gotip

go_std_tables.go

@@ -1,6 +1,6 @@
 // Code generated by scripts/gen-go-std-tables.sh; DO NOT EDIT.
 
-// Generated from Go version devel go1.21-e216ee7e74 Wed Jan 25 03:23:11 2023 +0000.
+// Generated from Go version devel go1.21-ffb07d0c66 Sat Feb 25 00:15:17 2023 +0000.
 
 package main
 
@@ -85,6 +85,7 @@ var compilerIntrinsicsFuncs = map[string]bool{
 	"math/bits.Reverse32":                     true,
 	"math/bits.Reverse64":                     true,
 	"math/bits.Reverse8":                      true,
+	"math/bits.ReverseBytes16":                true,
 	"math/bits.ReverseBytes32":                true,
 	"math/bits.ReverseBytes64":                true,
 	"math/bits.RotateLeft":                    true,