Sync TUF cache used for sigstore bundle verification (#166)

* sync tuf cache used for sigstore bundle verification

Signed-off-by: Meredith Lancaster <malancas@github.com>

* remove singleton err

Signed-off-by: Meredith Lancaster <malancas@github.com>

* start adding lock

Signed-off-by: Meredith Lancaster <malancas@github.com>

* Use RWMutex

Signed-off-by: Meredith Lancaster <malancas@github.com>

* pr feedback

Signed-off-by: Meredith Lancaster <malancas@github.com>

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Signed-off-by: Meredith Lancaster <malancas@github.com>

Fetch tags in actions/checkout (#164)

Signed-off-by: Cody Soyland <codysoyland@github.com>

Merge branch 'pr/malancas/1424' into release

Signed-off-by: Cody Soyland <codysoyland@github.com>

Merge pull request #1212 from tcnghia/update-aws-sdk

Update aws-sdk-go-v2/* to latest