Update optimade requirement from ~=0.16.11 to ~=0.16.12 (#412)

Updates the requirements on [optimade](https://github.com/Materials-Consortia/optimade-python-tools) to permit the latest version.
- [Release notes](https://github.com/Materials-Consortia/optimade-python-tools/releases)
- [Changelog](https://github.com/Materials-Consortia/optimade-python-tools/blob/master/CHANGELOG.md)
- [Commits](Materials-Consortia/optimade-python-tools@v0.16.11...v0.16.12)

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

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requirements.txt

@@ -4,7 +4,7 @@ cachecontrol[filecache]~=0.12.10
 ipywidgets~=7.7
 ipywidgets-extended>=1.1.1,<2
 nglview~=3.0
-optimade~=0.16.11
+optimade~=0.16.12
 pandas~=1.3
 requests~=2.27
 setuptools>=49.4

requirements/requirements_base.txt

@@ -3,7 +3,7 @@ cachecontrol[filecache]~=0.12.10
 ipywidgets~=7.7
 ipywidgets-extended>=1.1.1,<2
 nglview~=3.0
-optimade~=0.16.11
+optimade~=0.16.12
 pandas~=1.3
 requests~=2.27
 widget_periodictable~=3.0