use glob --exclude instead of glob --not (#38)

related to
- nushell/nushell#10827
- nushell/nushell#10839

## description
`glob --not` has been deprecated in
nushell/nushell#10827 and will be removed in
nushell/nushell#10839 before 0.88.0 in favor of
`glob --exclude`.

this PR performs the change in `nu-git-manager`.

Co-authored-by: Mel Massadian <melmassadian@gmail.com>

src/nu-git-manager/fs/store.nu

@@ -29,7 +29,7 @@ export def list-repos-in-store []: nothing -> list<path> {
     # first and then perform the globbing
     # related to https://github.com/nushell/nushell/issues/7125
     cd (get-repo-store-path)
-    let heads: list<string> = glob "**/HEAD" --not [
+    let heads: list<string> = glob "**/HEAD" --exclude [
             **/.git/**/refs/remotes/**/HEAD,
             **/.git/modules/**/HEAD,
             **/logs/HEAD