chore: Use Compatible release clause in requirement files (#1762)

requirements/base.txt

@@ -1,5 +1,5 @@
 pyrsistent~=0.16.0; python_version<"3"
-boto3~=1.5
+boto3~=1.15.16
 enum34~=1.1; python_version<"3.4"
 jsonschema~=3.2
 six~=1.15

requirements/dev.txt

@@ -1,21 +1,21 @@
-coverage>=5.3
-flake8>=3.8.4
-tox>=3.20.1
-pytest-cov>=2.10.1
+coverage~=5.3
+flake8~=3.8.4
+tox~=3.20.1
+pytest-cov~=2.10.1
 pylint>=1.7.2,<2.0
-pyyaml>=5.3.1
+pyyaml~=5.3.1
 
 # Test requirements
-pytest>=6.1.1; python_version >= '3.6'
+pytest~=6.1.1; python_version >= '3.6'
 pytest~=4.6.11; python_version < '3.6' # pytest dropped python 2 support after 4.6.x
 mock>=3.0.5,<4.0.0  # 4.0.0 drops Python 2 support
-parameterized>=0.7.4
+parameterized~=0.7.4
 
 # Requirements for examples
-requests>=2.24.0
+requests~=2.24.0
 
 # CLI requirements
-docopt>=0.6.2
+docopt~=0.6.2
 
 # formatter
 black==20.8b1; python_version >= '3.6'