Bump numpy from 1.21.2 to 1.21.4

Bumps [numpy](https://github.com/numpy/numpy) from 1.21.2 to 1.21.4.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](numpy/numpy@v1.21.2...v1.21.4)

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

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

requirements.txt

@@ -21,7 +21,7 @@ jupyter==1.0.0
 ligo-gracedb==2.7.6
 lxml==4.6.3
 matplotlib==3.4.3
-numpy==1.21.2
+numpy==1.21.4
 pandas==1.3.4
 psycopg2-binary==2.9.1
 pydantic==1.4

setup.py

@@ -46,7 +46,7 @@
         "ligo-gracedb == 2.7.6",
         "lxml==4.6.3",
         "matplotlib==3.4.3",
-        "numpy==1.21.2",
+        "numpy==1.21.4",
         "pandas == 1.3.4",
         "psycopg2-binary == 2.9.1",
         "pydantic == 1.4",