Bump inflection from 0.3.1 to 0.5.1

Bumps [inflection](https://github.com/jpvanhal/inflection) from 0.3.1 to 0.5.1.
- [Release notes](https://github.com/jpvanhal/inflection/releases)
- [Commits](jpvanhal/inflection@0.3.1...0.5.1)

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

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
 singer-python==5.1.1
 psycopg2==2.7.5
-inflection==0.3.1
+inflection==0.5.1

setup.py

@@ -20,7 +20,7 @@
       install_requires=[
           'pipelinewise-singer-python==1.*',
           'psycopg2-binary==2.8.5',
-          'inflection==0.3.1',
+          'inflection==0.5.1',
           'joblib==0.16.0'
       ],
       extras_require={