Refresh current index before trying to stash changes

In some cases, `git update-index -q --refresh` does not update
an index. Please read about "why?" on
https://stackoverflow.com/a/34808299/10418734. So, the `--refresh`
option is replaced with `--really-refresh` which aims to do a real
index refresh.

.workflows/ci-pipeline.bash

@@ -32,7 +32,7 @@ pipeline() {
         --verbose --file=/dev/null                    || fail "Unreadable todo is identified."
     (
         .workflows/docs-generation.bash
-        git update-index --refresh
+        git update-index --really-refresh
         git diff-index --quiet HEAD --
     ) || fail "The documentation is not up to date. Please run './.workflows/docs-generation.bash' and commit the changes"
 

libexec/plugins/pipe

@@ -6,7 +6,7 @@ stash-pipe() {
     # Makes automatic stash and unstash if possible
     # usage:  stash-pipe <command> [args]...
 
-    git update-index -q --refresh
+    git update-index -q --really-refresh
     if ! git diff-index --quiet HEAD --; then
         local message="Elegant Git auto-stash: "
         message+="WIP in '$(git rev-parse --abbrev-ref HEAD)' branch "
@@ -17,7 +17,7 @@ stash-pipe() {
     "${@}"
 
     if [[ -n "${message}" ]]; then
-        git update-index -q --refresh
+        git update-index -q --really-refresh
         git-verbose stash pop $(git stash list --grep="${message}" --format="%gd")
     fi
 }