Allow Swedish postcodes above 984 99

[cx18121]

Swedish postcodes above 984 99 are currently rejected, even though they are in active use. For example, Kiruna municipality publishes addresses using both 985 31 Vittangi and 986 31 Karesuando:

https://kiruna.se/utbildning--barnomsorg/grundskola/grundskolor/vittangi-skola.html

This removes the stale upper allocation bound and validates the stable postcode structure instead: five digits beginning with a non-zero digit.

The existing NNN NN formatting remains unchanged. Regression cases for 98531 and 98631 have been added to the existing Swedish formatter data provider.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.21%. Comparing base (a63ebc3) to head (a1d369c).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #24      +/-   ##
============================================
- Coverage     99.21%   99.21%   -0.01%     
+ Complexity      504      502       -2     
============================================
  Files           186      186              
  Lines          1021     1019       -2     
============================================
- Hits           1013     1011       -2     
  Misses            8        8              

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[BenMorel]

Thank you, @cx18121!

[BenMorel]

Released in 0.6.2.