fix: outfile file ending checked incorrectly

[codedust]

Fix bug introduced in 24efe89

see #76

[github-actions]

Performance impact

Impact on 9 metrics when merging patch-1 into main. Before drawing conclusion, keep in mind performance variability.

package metrics (-0.2%)

Metric	Before merge	After merge	Impact
import duration	0.2 second	0.2 second	-0.002 second / -1%	↘️
import memory heap used	8.9 MB	8.9 MB	+432 B / +0.005%	↗️
npm tarball size	26.2 kB	26.2 kB	-1 B / -0.004%	↘️
npm tarball unpacked size	115 kB	115 kB		👻
npm tarball file count	23	23		👻

write importmap metrics (-0.3%)

Metric	Before merge	After merge	Impact
write importmap duration	0.2 second	0.2 second	-0.002 second / -1%	↘️
write importmap memory heap used	9 MB	9 MB	+1.1 kB / +0.01%	↗️
number of fs read operation	0	0		👻
number of fs write operation	8	8		👻

_{Generated by @jsenv/performance-impact during performance_impact#14290366761 on cdc8a55}

[dmail]

I should add unit test to the cli 😅
can you bump the version in the package.json?
This way when I'll merge this pr it will publish this version to npm

[dmail]

Will be published by 00c8761