[LS] Windows issue on resolving string imports

[devbugging]

There's a windows specific issue when resolving string imports. The Sentry report:

Sentry Issue: LANGUAGE-SERVER-6V

runtime.errorString: runtime error: invalid memory address or nil pointer dereference
  File "/go/pkg/mod/github.com/onflow/cadence-tools/languageserver@v0.8.1-0.20230327102606-6be626d07eb8/integration/resolvers.go", line 41, in (*resolvers).stringImport
  File "/go/pkg/mod/github.com/onflow/cadence-tools/languageserver@v0.8.1-0.20230327102606-6be626d07eb8/server/server.go", line 2019, in (*Server).resolveImport
  File "/go/pkg/mod/github.com/onflow/cadence-tools/languageserver@v0.8.1-0.20230327102606-6be626d07eb8/server/server.go", line 2870, in (*Server).handleImport
  File "/go/pkg/mod/github.com/onflow/cadence@v0.37.0/runtime/sema/check_import_declaration.go", line 102, in (*Checker).importResolvedLocation
  File "/go/pkg/mod/github.com/onflow/cadence@v0.37.0/runtime/sema/check_import_declaration.go", line 65, in (*Checker).declareImportDeclaration
...
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https://dapperlabs.sentry.io/issues/3901167811/events/latest/?project=6330569&query=is%3Aunresolved+level%3Afatal&referrer=latest-event&stream_index=0