Bump bottle from 0.12.19 to 0.12.21 in /glances

Bumps [bottle](https://github.com/bottlepy/bottle) from 0.12.19 to 0.12.21.
- [Release notes](https://github.com/bottlepy/bottle/releases)
- [Changelog](https://github.com/bottlepy/bottle/blob/master/docs/changelog.rst)
- [Commits](bottlepy/bottle@0.12.19...0.12.21)

---
updated-dependencies:
- dependency-name: bottle
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

glances/requirements.txt

@@ -1,4 +1,4 @@
-bottle==0.12.19
+bottle==0.12.21
 docker==5.0.3
 glances==3.2.6.4
 influxdb==5.3.1