Fix bug in WKT point literal regex

[ullingerc]

This fixes a bug in the regular expression that is used for extracting points from WKT literals. The bug caused WKT literals with more than one digit but without a decimal point in the latitude coordinate to be falsely rejected as GeoPoints. Fixes #1579

[sparql-conformance[bot]]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=7beec3b60cec2393d4d184ecdb38045cf7d5dd05&prev=39e63b44de44f5bddd600cb3910cbc63648f565e

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.08%. Comparing base (f856919) to head (7beec3b). Report is 12 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1593 +/- ## ========================================== + Coverage 89.00% 89.08% +0.08% ========================================== Files 368 371 +3 Lines 33888 34437 +549 Branches 3828 3899 +71 ========================================== + Hits 30161 30678 +517 - Misses 2473 2484 +11 - Partials 1254 1275 +21 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud