Update globals.d.ts for Blob.slice() contentType declaration

[trashcoder]

Summary:

For the contentType Parameter of the method slice in Class Blob which was fixed for
#38078
the typescript declaration is missing.

Changelog:

[GENERAL] [ADDED] - Added contentType parameter to Blob declaration

Test Plan:

I ran yarn run test-typescript and check with Webstorm and VSCode.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	9,047,667	+1
android	hermes	armeabi-v7a	8,297,084	+2
android	hermes	x86	9,563,961	+2
android	hermes	x86_64	9,406,116	-1
android	jsc	arm64-v8a	9,606,384	+1
android	jsc	armeabi-v7a	8,733,108	+0
android	jsc	x86	9,693,421	+0
android	jsc	x86_64	9,939,709	-1

Base commit: f90829f
Branch: main

[facebook-github-bot]

@javache has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@javache merged this pull request in ff40138.