stack: Fix test expectations for go1.19 and update GA to go1.19

Bump github actions to run on go1.19.

When starting a program on macOS on go1.18 and earlier, it seems that
exec.Cmd.Run() used to evaluate symlinks. It is not true anymore on
go1.19. Update test expectations accordingly.

go1.19 also changed stack traces to not include assembly like it did
previously.

Test only change.

.github/workflows/test.yml

@@ -30,7 +30,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.18"]
+        gover: ["1.19"]
     env:
       PYTHONDONTWRITEBYTECODE: x
     steps:
@@ -101,7 +101,7 @@ jobs:
         # Windows.
         os: [ubuntu-latest, macos-latest, windows-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.18"]
+        gover: ["1.19"]
     env:
       PYTHONDONTWRITEBYTECODE: x
     steps:
@@ -280,7 +280,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.18"]
+        gover: ["1.19"]
     permissions:
       security-events: write
     steps:

stack/context_test.go

@@ -1546,11 +1546,18 @@ func TestGomoduleComplex(t *testing.T) {
 	}
 	rootLocal := rootRemote
 	if runtime.GOOS == "darwin" {
-		// On MacOS, the path is a symlink and it will be somehow evaluated when we
-		// get the traces back. This must NOT be run on Windows otherwise the path
-		// will be converted to 8.3 format.
-		if rootRemote, err = filepath.EvalSymlinks(rootLocal); err != nil {
-			t.Fatal(err)
+		if ver := internaltest.GetGoMinorVersion(); ver > 0 && ver < 19 {
+			// On MacOS, $TMPDIR path is a symlink /var -> /private/var.
+			//
+			// On versions before go1.19, it was somehow evaluated by exec.Cmd.Run().
+			// This stopped being true on go1.19. I suspect it is a side-effect of
+			// https://go.dev/doc/go1.19#os-exec-path
+			//
+			// This must NOT be run on Windows otherwise the path will be converted
+			// to 8.3 format.
+			if rootRemote, err = filepath.EvalSymlinks(rootLocal); err != nil {
+				t.Fatal(err)
+			}
 		}
 	}
 
@@ -2386,9 +2393,15 @@ func identifyPanicwebSignature(t *testing.T, b *Bucket, pwebDir string) panicweb
 				if l := len(b.Stack.Calls); l != 4 {
 					t.Fatalf("expected %d calls, got %d", 4, l)
 				}
-				// The first item shall be an assembly file independent of the OS.
-				if s := b.Stack.Calls[0].RelSrcPath; !strings.HasSuffix(s, ".s") {
-					t.Fatalf("expected assembly file, got %q", s)
+				// The first item shall be an assembly file independent of the OS on Go
+				// < 1.19.
+				s := b.Stack.Calls[0].RelSrcPath
+				if ver := internaltest.GetGoMinorVersion(); ver > 0 && ver < 19 {
+					if !strings.HasSuffix(s, ".s") {
+						t.Fatalf("expected assembly file, got %q", s)
+					}
+				} else if !strings.HasPrefix(s, "syscall") && !strings.HasSuffix(s, ".go") {
+					t.Fatalf("expected syscall go file, got %q", s)
 				}
 			}
 			// Process the golang.org/x/sys call specifically.