[3.12] Fix error message of "Check if Autoconf files are up to date" …

…job (GH-126683) (#126718)

Fix error message of "Check if Autoconf files are up to date" job (GH-126683)
(cherry picked from commit 0052a8c)

Co-authored-by: sobolevn <mail@sobolevn.me>

.github/workflows/build.yml

@@ -127,7 +127,7 @@ jobs:
           # Check for changes in regenerated files
           if test -n "$changes"; then
             echo "Generated files not up to date."
-            echo "Perhaps you forgot to run make regen-all or build.bat --regen. ;)"
+            echo "Perhaps you forgot to run make regen-configure ;)"
             echo "configure files must be regenerated with a specific version of autoconf."
             echo "$changes"
             echo ""