[dependency]: Bump symbol-sdk-python in /explorer/rest

Bumps [symbol-sdk-python](https://github.com/symbol/symbol) from 3.0.11 to 3.1.0.
- [Release notes](https://github.com/symbol/symbol/releases)
- [Commits](symbol/symbol@sdk/python/v3.0.11...sdk/python/v3.1.0)

---
updated-dependencies:
- dependency-name: symbol-sdk-python
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

explorer/rest/requirements.txt

@@ -1,6 +1,6 @@
 aiohttp==3.8.4
 Flask==2.2.3
 psycopg2-binary==2.9.6
-symbol-sdk-python==3.0.11
+symbol-sdk-python==3.1.0
 zenlog==1.1
 Path==16.6.0