Loosen tenacity dependency (#158)

Loosen the version of tenacity required to improve compatibility with other deps (such as airflow) especially under new pip resolver. I did a comparison of the tenacity code between 4.12 and 6.0, and didn't see anything that we relied on.

.python-version

@@ -1 +1 @@
-records-mover-3.9.0
+records-mover-3.9.1

deps.sh

@@ -7,7 +7,7 @@ export SLUGIFY_USES_TEXT_UNIDECODE=yes
 brew update && ( brew upgrade pyenv || true )
 pyenv rehash  # needed if pyenv is updated
 
-python_version=3.9.0
+python_version=3.9.1
 # zipimport.ZipImportError: can't decompress data; zlib not available:
 #    You may need `xcode-select --install` on OS X
 #    https://github.com/pyenv/pyenv/issues/451#issuecomment-151336786

metrics/bigfiles_high_water_mark

@@ -1 +1 @@
-1147
+1149

setup.py

@@ -134,7 +134,9 @@ def initialize_options(self) -> None:
 )
 
 airflow_dependencies = [
-    'apache-airflow>=1.10,<2'
+    # Minimum version here is needed to avoid syntax error in setup.py
+    # in 1.10.0
+    'apache-airflow>=1.10.1,<2'
 ]
 
 db_dependencies = [
@@ -326,7 +328,7 @@ def initialize_options(self) -> None:
           # resulting in runtime complaints.  Can be removed once 20.4
           # is proven to work.
           'chardet>=3,<4',
-          'tenacity>=6<7',
+          'tenacity>=4.12.0,<7',
           # v5.0.1 resolves https://github.com/exhuma/config_resolver/issues/69
           'config-resolver>=5.0.1,<6',
           'typing_inspect',