Bump sphinx-tabs from 3.0.0 to 3.1.0

Bumps [sphinx-tabs](https://github.com/executablebooks/sphinx-tabs) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/executablebooks/sphinx-tabs/releases)
- [Changelog](https://github.com/executablebooks/sphinx-tabs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/executablebooks/sphinx-tabs/compare/v3.0.0...v3.1.0)

---
updated-dependencies:
- dependency-name: sphinx-tabs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/docs.txt

@@ -29,7 +29,7 @@ packaging==20.9
     #   pallets-sphinx-themes
     #   sphinx
 pallets-sphinx-themes==2.0.1
-    # via -r docs.in
+    # via -r requirements/docs.in
 pygments==2.9.0
     # via
     #   sphinx
@@ -42,17 +42,17 @@ requests==2.25.1
     # via sphinx
 snowballstemmer==2.1.0
     # via sphinx
-sphinx-issues==1.2.0
-    # via -r docs.in
-sphinx-tabs==3.0.0
-    # via -r docs.in
 sphinx==4.0.2
     # via
-    #   -r docs.in
+    #   -r requirements/docs.in
     #   pallets-sphinx-themes
     #   sphinx-issues
     #   sphinx-tabs
     #   sphinxcontrib-log-cabinet
+sphinx-issues==1.2.0
+    # via -r requirements/docs.in
+sphinx-tabs==3.1.0
+    # via -r requirements/docs.in
 sphinxcontrib-applehelp==1.0.2
     # via sphinx
 sphinxcontrib-devhelp==1.0.2
@@ -62,7 +62,7 @@ sphinxcontrib-htmlhelp==1.0.3
 sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-log-cabinet==1.0.1
-    # via -r docs.in
+    # via -r requirements/docs.in
 sphinxcontrib-qthelp==1.0.3
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.4