patch 9.1.1718: filetype: kubectl config file is not recognized

Problem:  filetype: kubectl config file is not recognized
Solution: Detect .kube/kubectl as yaml filetype
          (Volodymyr Chernetskyi).

References:
- https://kubernetes.io/docs/reference/kubectl/kuberc/

closes: #18169

Signed-off-by: Volodymyr Chernetskyi <19735328+chernetskyi@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_filetype.vim

@@ -931,7 +931,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     xslt: ['file.xsl', 'file.xslt'],
     yacc: ['file.yy', 'file.yxx', 'file.y++'],
     yaml: ['file.yaml', 'file.yml', 'file.eyaml', 'file.kyaml', 'file.kyml', 'any/.bundle/config', '.clangd', '.clang-format', '.clang-tidy', 'file.mplstyle', 'matplotlibrc', 'yarn.lock',
-           '/home/user/.kube/config', '.condarc', 'condarc', 'pixi.lock'],
+           '/home/user/.kube/config', '/home/user/.kube/kuberc', '.condarc', 'condarc', 'pixi.lock'],
     yang: ['file.yang'],
     yuck: ['file.yuck'],
     z8a: ['file.z8a'],

src/version.c

@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1718,
 /**/
     1717,
 /**/