Update mdbook to 0.4.45 in CI (#6973)

Co-authored-by: Sophie Dankel <47993817+sdankel@users.noreply.github.com>

Author: IGI-111

.github/workflows/gh-pages.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
         with:
-          mdbook-version: "0.4.25"
+          mdbook-version: "0.4.45"
 
       - name: Build Sway book
         run: MDBOOK_preprocessor__FORC_documenter__STRICT="true" mdbook build docs/book