Release v7.6.0

Release v7.5.1 (#2227)

* Update changelog for v7.5.1 release

* Create versioned docs for release v7.5.x
Created using: yarn run docusaurus docs:version 7.5.x

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Co-authored-by: Joel Speed <Joel.speed@hotmail.co.uk>

Merge pull request #2213 from kvanzuijlen/release-v7.5.0

Release v7.5.0

Merge pull request #1867 from oauth2-proxy/release-v7.4.0

Release v7.4.0

Merge pull request #1665 from oauth2-proxy/release-7.3.0

Release 7.3.0

Merge pull request #1481 from oauth2-proxy/release-v7.2.1

Prepare changelog for release v7.2.1

Merge pull request #1412 from oauth2-proxy/release-7.2.0

Release 7.2.0

Merge pull request #1171 from oauth2-proxy/release-v7.1.3

Update Changelog for release v7.1.3

Merge pull request #1145 from oauth2-proxy/release-v7.1.2

Update Changelog for release v7.1.2

Merge pull request #1138 from oauth2-proxy/release-7.1.1

Prepare for release v7.1.1