[release-v1.0.x] fix(#8940): token-authentication header typo in git resolver

[tekton-robot]

This is an automated cherry-pick of #8937

/assign waveywaves

Bug fix: Before this change, there was a regression in which the git resolver was not authenticating with the provided `gitToken` and `gitTokenKey`, breaking the git resolver's http token-based auth. After this change, all git operations performed by the git resolver use the provided `gitToken` for remote authentication.

[tekton-robot]

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[vdemeester]

/kind bug

[vdemeester]

/retest

[waveywaves]

/retest

[waveywaves]

lint issues are possibly happening here because the changes from #8942 aren't present

cc @vdemeester

[waveywaves]

t.Context() was added in golang 1.24 so to have this change we will have to update the go version to 1.24 for this branch as well. Just updating the CI won't help.

[waveywaves]

@aThorp96 could you look into this ?

[aThorp96]

@waveywaves I can't seem to push to tekton-robot's fork branch or even create a PR to their fork so I created a separate cherry-pick PR with the go-version compatibility fix. This PR can be closed in favor of #8947

[tekton-robot]

@tekton-robot: PR needs rebase.

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