build(deps): update gspread requirement from ~=6.0.1 to ~=6.0.2

Updates the requirements on [gspread](https://github.com/burnash/gspread) to permit the latest version.
- [Release notes](https://github.com/burnash/gspread/releases)
- [Changelog](https://github.com/burnash/gspread/blob/master/HISTORY.rst)
- [Commits](burnash/gspread@v6.0.1...v6.0.2)

---
updated-dependencies:
- dependency-name: gspread
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,6 +1,6 @@
 discord.py~=2.3.2
 feedparser~=6.0.11
-gspread~=6.0.1
+gspread~=6.0.2
 jishaku~=2.5.2
 markdownify~=0.11.6
 psutil~=5.9.8