CI: bump gotip to December 2022

Go 1.20 isn't far away at this point,
and we're well into the freeze.

Also note that a build error output got refined again.

.github/workflows/test.yml

@@ -84,7 +84,7 @@ jobs:
     steps:
     - name: Install Go
       env:
-        GO_COMMIT: 122a22e0e9eba7fe712030d429fc4bcf6f447f5e # 2022-11-12
+        GO_COMMIT: cb07765045aed5104a3df31507564ac99e6ddce8 # 2022-12-13
       run: |
         cd $HOME
         mkdir $HOME/gotip

testdata/script/reverse.txtar

@@ -163,7 +163,7 @@ test/main/build-error/error.go:18: cannot convert UnobfuscatedStruct{} (value of
 exit status 2
 exit status 2
 -- build-error-reverse.stdout-go1.20 --
-go build test/main/build-error: # test/main/build-error
+# test/main/build-error
 test/main/build-error/error.go:18: cannot convert UnobfuscatedStruct{} (value of type UnobfuscatedStruct) to type struct{SomeField int}
 exit status 2
 exit status 1