build(deps-dev): bump matrix-synapse in /requirements

Bumps [matrix-synapse](https://github.com/matrix-org/synapse) from 1.33.0 to 1.45.1.
- [Release notes](https://github.com/matrix-org/synapse/releases)
- [Changelog](https://github.com/matrix-org/synapse/blob/develop/CHANGES.md)
- [Commits](matrix-org/synapse@v1.33.0...v1.45.1)

---
updated-dependencies:
- dependency-name: matrix-synapse
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/requirements-ci.txt

@@ -304,6 +304,10 @@ idna==2.8
     #   requests
     #   twisted
     #   yarl
+ijson==3.1.4
+    # via
+    #   -r requirements-dev.txt
+    #   matrix-synapse
 importlib-metadata==4.8.1
     # via
     #   -r requirements-dev.txt
@@ -383,7 +387,7 @@ matplotlib-inline==0.1.2
     #   ipython
 matrix-client==0.3.2
     # via -r requirements-dev.txt
-matrix-synapse==1.33.0
+matrix-synapse==1.45.1
     # via -r requirements-dev.txt
 mccabe==0.6.1
     # via

requirements/requirements-dev.txt

@@ -277,6 +277,8 @@ idna==2.8
     #   requests
     #   twisted
     #   yarl
+ijson==3.1.4
+    # via matrix-synapse
 importlib-metadata==4.8.1
     # via pluggy
 incremental==17.5.0
@@ -341,7 +343,7 @@ matplotlib-inline==0.1.2
     # via ipython
 matrix-client==0.3.2
     # via -r requirements.txt
-matrix-synapse==1.33.0
+matrix-synapse==1.45.1
     # via -r requirements-dev.in
 mccabe==0.6.1
     # via