Fix the failing tests getting spectra from ESA Sky

This will fix the test test_esasky_get_spectra for mission HST-UV and HST-OPTICAL.
I can't find anything on our end that explains why these tests started failing. We have
a rather small default radius (5 arc seconds) where we look for spectra. Maybe the
underlying data changed, or the M1 supernova moved slightly in the CDS name resolver?

Author: emellega

astroquery/esasky/tests/test_esasky_remote.py

@@ -183,7 +183,7 @@ def test_esasky_get_spectra(self, tmp_path, mission):
         # - HST-IR, JWST-MID-IR and CHEOPS have no data
         # - LAMOST does not support download
         # - JWST-NEAR-IR returns a zip file with many fits files in it, unsupported
-        result = ESASky.get_spectra(position="M1", missions=mission, download_dir=tmp_path)
+        result = ESASky.get_spectra(position="M1", missions=mission, radius='15 arcsec', download_dir=tmp_path)
         assert Path(tmp_path, mission.upper()).exists()
 
         if mission != "Herschel":