Reduce Docker image size

[ngosang]

• [x] I have read the contributing guideline and understand that I have made the correct modifications

Description:

• Reduce Docker image size. Removed libraries are not used and not required.

Benefits of this PR and context:

• Image size 262 MB => 249 MB

How Has This Been Tested?

• Tested Docker image in local with arch AMD64

Source / References:

NOTE: I'm the main developer in Jackett.

[LinuxServer-CI]

I am a bot, here are the test results for this PR: https://ci-tests.linuxserver.io/lspipepr/jackett/v0.19.275-pkg-77ad9393-pr-119/index.html https://ci-tests.linuxserver.io/lspipepr/jackett/v0.19.275-pkg-77ad9393-pr-119/shellcheck-result.xml

[ngosang]

@Roxedus @aptalca could you take a look?

[ngosang]

@thelamer ?