test: add 6d tests

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
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    status: na
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    status: na
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    status: na
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    status: na
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    status: na
  - task: lint_javascript_tests
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    status: na
  - task: lint_c_src
    status: na
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    status: na
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    status: na
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    status: na
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    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/some-by/test/test.4d.js

@@ -1162,7 +1162,7 @@ tape( 'the function tests whether at `n` elements in a 4-dimensional ndarray pas
 	dt = 'float64';
 	ord = 'column-major';
 	sh = [ 2, 1, 2, 1 ];
-	st = [ -1, -2, -2, -2 ];
+	st = [ -1, -2, -2, -4 ];
 	o = strides2offset( sh, st );
 
 	x = ndarray( dt, zeros( numel( sh ), dt ), sh, st, o, ord );

lib/node_modules/@stdlib/ndarray/base/some-by/test/test.5d.js

@@ -1291,7 +1291,7 @@ tape( 'the function tests whether at `n` elements in a 5-dimensional ndarray pas
 	dt = 'float64';
 	ord = 'column-major';
 	sh = [ 2, 1, 2, 1, 2 ];
-	st = [ -1, -2, -2, -2, -2 ];
+	st = [ -1, -2, -2, -4, -4 ];
 	o = strides2offset( sh, st );
 
 	x = ndarray( dt, zeros( numel( sh ), dt ), sh, st, o, ord );