Update changelog for 3.38.1-1pureos3 release

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Status Job ID Name Coverage
  Package
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librem5
package:deb-debian-buster

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passed #303769
librem5:arm64
package:deb-debian-buster:arm64

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  Test Package
passed #303770
librem5
autopkgtest-debian-buster-package

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passed #303771
librem5
lintian-debian-buster-package

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