tests: add pyproj to requirements

requirements-test-libraries.txt

@@ -7,6 +7,7 @@ dash==1.19.0
 dash-bootstrap-components==0.12.0
 iminuit==2.4.0
 markdown==3.2.1
+MetPy==1.0.0
 openpyxl==3.0.3
 pendulum==2.0.5
 phonenumbers==8.12.1
@@ -17,6 +18,7 @@ pycryptodome==3.9.7
 pycryptodomex==3.9.7
 pyexcelerate==0.8.0
 pylint==2.4.4
+pyproj==3.0.1
 pyusb==1.0.2
 pyzmq==22.0.3
 Unidecode==1.1.1
@@ -39,10 +41,6 @@ pandas==1.2.3; python_version >= '3.7'
 # PyEnchant only pre-builds macOS and Windows
 pyenchant==3.0.1; sys_platform == 'darwin' or sys_platform == 'win32'
 
-# MetPy requires pyproj, which in turn requires proj binaries on
-# linux (can be installed via package manager) and macOS (not available)
-MetPy==1.0.0; sys_platform != 'darwin'
-
 # uvloop does not currently support Windows.
 uvloop==0.14.0; sys_platform != 'win32'