Update dependency mkdocs-material to v9.1.21

This MR contains the following updates:

Package	Update	Change
mkdocs-material	patch	9.1.19 -> 9.1.21
mkdocs-material	patch	==9.1.19 -> ==9.1.21

---

Release Notes

squidfunk/mkdocs-material

v9.1.21: mkdocs-material-9.1.21

Compare Source

• Fixed MkDocs 1.4 compat issue in social plugin (9.1.20 regression)

v9.1.20: mkdocs-material-9.1.20

Compare Source

• Updated Sanskrit translations
• Fixed deprecation warnings for social plugin

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.