Bump all packages to 13.1.0

[theopnv]

Purpose of this PR

• Bumped SRP packages to 13.1.0
• Moved some release notes to the new section, as they were added after the commit used for the current vendoring (and therefore correspond to the next vendoring).

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Testing status

Package Tests (upm validation): https://unity-ci.cds.internal.unity3d.com/project/902/branch/srp%2Fbump-packages/jobDefinition/.yamato%2F_projectcontext.yml%23all_package_ci_project_trunk

[github-actions]

Hi! This comment will help you figure out which jobs to run before merging your PR. The suggestions are dynamic based on what files you have changed.
Link to Yamato: https://yamato.cds.internal.unity3d.com/jobs/902-Graphics
Search for your PR branch using the sidebar on the left, then add the following segment(s) to the end of the URL (you may need multiple tabs depending on how many packages you change)

HDRP
/.yamato%252Fall-hdrp.yml%2523PR_HDRP_trunk
With changes to HDRP packages, you should also run
/.yamato%252Fall-lightmapper.yml%2523PR_LightMapper_trunk

URP
/.yamato%252Fall-urp.yml%2523PR_URP_trunk
With changes to URP packages, you should also run
/.yamato%252Fall-lightmapper.yml%2523PR_LightMapper_trunk

Shader Graph
/.yamato%252Fall-shadergraph.yml%2523PR_ShaderGraph_trunk
Depending on your PR, you may also want
/.yamato%252Fall-shadergraph_builtin_foundation.yml%2523PR_ShaderGraph_BuiltIn_Foundation_trunk
/.yamato%252Fall-shadergraph_builtin_lighting.yml%2523PR_ShaderGraph_BuiltIn_Lighting_trunk

VFX
/.yamato%252Fall-vfx.yml%2523PR_VFX_trunk

SRP Core
You could run ABV on your branch before merging your PR, but it will start A LOT of jobs. Please be responsible about it and run it only when you feel the PR is ready:
/.yamato%252F_abv.yml%2523all_project_ci_trunk
Be aware that any modifications to the Core package impacts everyone in the Graphics repo so please discuss the PR with your lead.

Depending on the scope of your PR, you may need to run more jobs than what has been suggested. Please speak to your lead or a Graphics SDET (#devs-graphics-automation) if you are unsure.

[sebastienlagarde]

see the various remark for 21.2 PR

[theopnv]

• Added the PR review requested changes
• Merged latest master
• Unbumped the templates as they will be bumped in a separate PR [HDRP][URP] update manifest of SRP templates #5799

[sebastienlagarde]

removed this one, there is item here

[ernestasKupciunas]

I've done some smoke testing - imported all the URP required packages and checked if there are no conflicts/ errors. Works fine